chore: fix comment formatting and typos across codebase

[criciss]

Description

fix comment formatting and typos across codebase

How Has This Been Tested?

• Tested CCTX in localnet
• Tested in development environment
• Go unit tests
• Go integration tests
• Tested via GitHub Actions

Greptile Summary

This PR makes comment-only fixes across three files — correcting duplicate words, extra spaces before commas, "ZRC4" → "ZRC20" label references, and minor grammar. No functional code is changed.

• The VoteOutbound doc comment in msg_server_vote_outbound.go now reads as an incomplete sentence (missing verb) after is minted was removed.
• BalanceOfZRC4 and TotalSupplyZRC4 in evm.go have their godoc lines updated to reference ZRC20 while the function names still say ZRC4, violating Go's naming convention for doc comments.
• A pre-existing \"into to account\" typo in DepositZRC20's comment was not fixed despite a similar fix being made in DepositZeta.

Confidence Score: 4/5

Safe to merge — comment-only changes with no functional impact, minor remaining comment quality issues.

All changes are cosmetic (comments only), so there is zero risk of runtime regression. The score is held to 4 rather than 5 due to three P2 comment-quality issues introduced or missed by this PR: an incomplete sentence, a godoc name mismatch, and an unfixed typo.

x/fungible/keeper/evm.go (godoc name mismatch for BalanceOfZRC4/TotalSupplyZRC4, missed "into to" typo) and x/crosschain/keeper/msg_server_vote_outbound.go (incomplete sentence)

Important Files Changed

Filename	Overview
x/crosschain/keeper/gas_payment.go	Single comment fix: removed duplicate "chain" word and extra space before comma — clean and correct.
x/crosschain/keeper/msg_server_vote_outbound.go	Two comment fixes: punctuation/spacing improvements in refundUnusedGas are good, but the VoteOutbound doc comment now has a missing verb after removing "is minted".
x/fungible/keeper/evm.go	Several comment fixes are good, but BalanceOfZRC4 and TotalSupplyZRC4 godoc names were changed to "ZRC20" while the function names remain "ZRC4", and a "into to" typo in DepositZRC20 was missed.

Flowchart

%%{init: {'theme': 'neutral'}}%%
flowchart TD
    A[PR: Fix comment formatting & typos] --> B[gas_payment.go]
    A --> C[msg_server_vote_outbound.go]
    A --> D[evm.go]

    B --> B1["✅ 'chain chain id ,' → 'chain id,'"]

    C --> C1["✅ Punctuation fixes in refundUnusedGas"]
    C --> C2["⚠️ VoteOutbound doc: removed 'is minted' → incomplete sentence"]

    D --> D1["✅ 'ZRC4' → 'ZRC20' in DepositZRC20 comment"]
    D --> D2["✅ 'and account' → 'an account' in DepositZeta"]
    D --> D3["✅ Trailing space before comma fixes"]
    D --> D4["✅ 'Marshall' → 'Marshal'"]
    D --> D5["⚠️ BalanceOfZRC4/TotalSupplyZRC4 godoc names now say 'ZRC20'"]
    D --> D6["⚠️ 'into to account' typo still present in DepositZRC20"]

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Prompt To Fix All With AI

Fix the following 3 code review issues. Work through them one at a time, proposing concise fixes.

---

### Issue 1 of 3
x/crosschain/keeper/msg_server_vote_outbound.go:28-30
**Incomplete sentence after removing "is minted"**

The edit removed `is minted` to avoid the awkward repetition, but the resulting sentence now lacks a main verb — "the difference between zeta burned and minted by the bank module and deposited into the module account" is a noun phrase with no predicate. Consider restoring the verb with a cleaner rewrite.

```suggestion
// If the observation is successful, the difference between zeta burned
// and minted is deposited into the module
// account by the bank module.
```

### Issue 2 of 3
x/fungible/keeper/evm.go:622-623
**Godoc comment name doesn't match function name**

Go's convention is that a doc comment must begin with the exact name of the symbol it documents so that `go doc` and IDEs can associate it correctly. Changing the comment to `BalanceOfZRC20` while the function is still named `BalanceOfZRC4` creates a mismatch — the same issue exists one function below for `TotalSupplyZRC4` (comment now reads `TotalSupplyZRC20`). Either revert the comment names to match the functions, or rename the functions themselves.

```suggestion
// BalanceOfZRC4 queries an account's balance for a given ZRC20 contract
func (k Keeper) BalanceOfZRC4(
```

### Issue 3 of 3
x/fungible/keeper/evm.go:245
**Missed typo: "into to" should be "into an"**

The PR fixed a similar "and" → "an" typo in `DepositZeta` but left `DepositZRC20` with the same malformed phrase.

```suggestion
// DepositZRC20 deposits ZRC20 tokens into an account;
```

_{Reviews (1): Last reviewed commit: "chore: fix comment formatting and typos ..." | Re-trigger Greptile}

Greptile also left 3 inline comments on this PR.

Summary by CodeRabbit

• Documentation

  • Improved inline code documentation across keeper modules for clarity and consistency.

• Chores

  • Minor formatting refinements in error handling paths.

Note: This release contains internal code improvements with no user-facing changes or new functionality.

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📝 Walkthrough

Walkthrough

Documentation updates clarify chainID semantics in gas payment logic, reword early-return conditions in vote outbound, update terminology from ZRC4 to ZRC20 in fungible keeper, and adjust spacing in error message formatting. No executable logic changed.

Changes

Documentation and Error Message Formatting

Layer / File(s)	Summary
Comment Clarifications x/crosschain/keeper/gas_payment.go, x/crosschain/keeper/msg_server_vote_outbound.go, x/fungible/keeper/evm.go	Clarified chainID semantics for outbound transactions in PayGasAndUpdateCctx, reworded early-return conditions in refundUnusedGas, and updated ZRC4 references to ZRC20 in doc comments for DepositZRC20, BalanceOfZRC20, and TotalSupplyZRC20.
Error Message Formatting x/fungible/keeper/evm.go	Adjusted spacing in JSON-marshalling error formatting within CallEVM (added space after comma) while preserving all control flow and error handling behavior.

---

Estimated code review effort

🎯 1 (Trivial) | ⏱️ ~3 minutes

🚥 Pre-merge checks | ✅ 4 | ❌ 1

❌ Failed checks (1 inconclusive)

Check name	Status	Explanation	Resolution
Description check	❓ Inconclusive	The pull request description addresses the core purpose (fixing comment formatting and typos) but lacks substantive detail about the scope and impact of changes.	Expand the description to enumerate affected files, clarify the nature of fixes (formatting vs. typo corrections), and provide rationale for why these changes improve code quality or maintainability.

✅ Passed checks (4 passed)

Check name	Status	Explanation
Title check	✅ Passed	The title accurately describes the changes as comment formatting and typo fixes, which aligns with the file-level summaries showing only documentation updates.
Docstring Coverage	✅ Passed	No functions found in the changed files to evaluate docstring coverage. Skipping docstring coverage check.
Linked Issues check	✅ Passed	Check skipped because no linked issues were found for this pull request.
Out of Scope Changes check	✅ Passed	Check skipped because no linked issues were found for this pull request.

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Actionable comments posted: 3

🤖 Prompt for all review comments with AI agents

Verify each finding against the current code and only fix it if needed.

Inline comments:
In `@x/fungible/keeper/evm.go`:
- Line 245: Update the comment for the DepositZRC20 function to fix the
grammar/typo ("into to account"); change it to a clear phrase such as
"DepositZRC20 deposits ZRC20 tokens into an account" or "DepositZRC20 deposits
ZRC20 tokens into the account" by editing the comment above the DepositZRC20
declaration so it reads correctly and matches surrounding comment style.
- Around line 650-651: The doc comment above the function is inconsistent: it
references "TotalSupplyZRC20" while the function is named TotalSupplyZRC4;
update the comment to match the function name by changing the comment to
"TotalSupplyZRC4 queries the total supply of a given ZRC4 contract" (or, if you
intend to standardize on ZRC20 instead, rename the function to TotalSupplyZRC20
and update all references accordingly); ensure the function signature
TotalSupplyZRC4 and any associated tests/docs use the same name to keep comments
and code aligned.
- Around line 622-623: Update the doc comment to match the function name: change
the opening comment from "BalanceOfZRC20 queries an account's balance for a
given ZRC20 contract" to "BalanceOfZRC4 queries an account's balance for a given
ZRC4 contract" (or otherwise replace ZRC20 with ZRC4) so the comment aligns with
the function BalanceOfZRC4; do not rename the function in this PR to avoid a
breaking change.

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Fix all unresolved CodeRabbit comments on this PR:

• Push a commit to this branch (recommended)
• Create a new PR with the fixes

---

ℹ️ Review info

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📥 Commits

Reviewing files that changed from the base of the PR and between 9a516a3 and 3d9d8fb.

📒 Files selected for processing (3)

• x/crosschain/keeper/gas_payment.go
• x/crosschain/keeper/msg_server_vote_outbound.go
• x/fungible/keeper/evm.go