docs(cli): attach --env help to the right field in dora start

[phil-opp]

Issue

In binaries/cli/src/command/start/mod.rs, the env field's doc-comment block was written above the exit_when_nodes_finish field, with no field in between:

/// Set an environment variable for every node of this dataflow
/// ... (env docs) ...
/// visible in `ps` — prefer a node `env:` block for secrets.
/// Exit once every node has finished, treating `dora/timer/...`   // exit_when_nodes_finish docs
/// ...
#[clap(long, num_args = 0..=1, ...)]
pub exit_when_nodes_finish: Option<bool>,
#[clap(long = "env", value_name = "KEY=VALUE")]
env: Vec<String>,   // <- no doc comment

In clap's derive (like Rust doc comments) a /// block attaches to the next item. So both blocks concatenated onto exit_when_nodes_finish, and env got none. The result in dora start --help:

• --exit-when-nodes-finish <BOOL> — help text begins "Set an environment variable for every node of this dataflow…" (wrong).
• --env <KEY=VALUE> — no description at all.

The sibling dora run command (run.rs) has the correct layout — one doc block per field — so start was the regressed copy.

Fix

Reorder the two doc blocks so each sits directly above its own field, mirroring run.rs. This is a pure doc-comment move — no logic, no flag, and no behavior changes.

Validation

• cargo +1.97.1 fmt -p dora-cli -- --check — clean.
• cargo +1.97.1 clippy -p dora-cli -- -D warnings — clean (compiles with the change).

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⚠️ This is a machine-generated pull request authored by Claude (Claude Code). A human should review before merging.

🤖 Generated with Claude Code

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Generated by Claude Code

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[phil-opp]

🤖 Automated review by Claude Code — fully automated review, not vetted by a human.

No issues found. This is a pure doc-comment move: the --env help block previously sat above exit_when_nodes_finish with no field between them, so clap's derive attached it to exit_when_nodes_finish and left --env undocumented. The diff relocates each block directly above its own field, matching run.rs. No logic or flag changes, and the text is moved verbatim.

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Generated by Claude Code

[phil-opp]

Duplicate of #2992