docs: update setup guide link in CONTRIBUTING

[sumitsaurabh927]

Summary

• Point the AI API key setup link in CONTRIBUTING.md to the current docs URL: https://lingo.dev/en/docs/cli/setup (was https://lingo.dev/en/cli/quick-start#step-2-authentication).

Test plan

• Link target resolves to the current setup guide
• Empty changeset included (docs-only change, no release)

🤖 Generated with Claude Code

In fix to a broken link as reported by our community member Ashutosh here: https://discord.com/channels/1193198600298172486/1295803478534393886/1497981361330585833

[coderabbitai]

📝 Walkthrough

Walkthrough

Two minimal administrative updates: introduction of a placeholder changeset file and correction of a documentation hyperlink in the contributing guide for AI API key setup procedures.

Changes

Cohort / File(s)	Summary
Changeset Management .changeset/perky-stars-burn.md	New empty changeset entry with YAML frontmatter placeholder.
Documentation Updates CONTRIBUTING.md	Updated hyperlink for AI API key documentation from CLI quick-start to newer CLI setup docs page.

Estimated code review effort

🎯 1 (Trivial) | ⏱️ ~3 minutes

Suggested reviewers

• vrcprl

Poem

🐰 A changeset born, though empty and bare,
A link updated with docs-management care,
Two tiny tweaks, so simple and clean,
The rabbit approves of what's been seen!

🚥 Pre-merge checks | ✅ 5

✅ Passed checks (5 passed)

Check name	Status	Explanation
Title check	✅ Passed	The title accurately describes the main change: updating a setup guide link in the CONTRIBUTING documentation.
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.
Description check	✅ Passed	The PR description clearly explains the purpose (updating a broken link), includes test validation, and provides context from community feedback.

_{✏️ Tip: You can configure your own custom pre-merge checks in the settings.}

✨ Finishing Touches

📝 Generate docstrings

• Create stacked PR
• Commit on current branch

🧪 Generate unit tests (beta)

• Create PR with unit tests
• Commit unit tests in branch docs/update-setup-guide-link

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