docs: fix typos in environment variables guide

[karlsune]

Two typo fixes in docs/router/how-to/use-environment-variables.md (prose, "Example" section):

• prefered → preferred
• libray → library

Testing

Prose-only markdown edit (two words in one sentence); no code or examples touched, no build needed.

AI disclosure

Prepared with AI assistance (automated draft, per the AI-assisted contributions policy). The edit is fully understood and verified against the source text; the contribution is a minimal typo fix, not verbatim LLM output.

Summary by CodeRabbit

• Documentation
  • Corrected a spelling error in the runtime client environment variables example description.

[coderabbitai]

No actionable comments were generated in the recent review. 🎉

ℹ️ Recent review info

⚙️ Run configuration

Configuration used: defaults

Review profile: CHILL

Plan: Pro Plus

Run ID: 703f8998-31b2-4fcf-a812-8012f606c810

📥 Commits

Reviewing files that changed from the base of the PR and between cb281d7 and c206fae.

📒 Files selected for processing (1)

• docs/router/how-to/use-environment-variables.md

Included review availability: Your plan provides up to 10 included reviews per hour; 9 remain after this review.

---

📝 Walkthrough

Walkthrough

The environment variables guide corrects typographical errors in the runtime client example description.

Changes

Documentation update

Layer / File(s)	Summary
Correct backend description docs/router/how-to/use-environment-variables.md	Corrected typographical errors in the preferred backend framework/library description.

Estimated code review effort: 1 (Trivial) | ~2 minutes

Merge Risk: ⚪ Minimal · up to c206f

This PR only corrects two typos in documentation and does not change code, examples, or runtime behavior; no actionable merge-blocking risk remains.

🚥 Pre-merge checks | ✅ 5

✅ Passed checks (5 passed)

Check name	Status	Explanation
Description Check	✅ Passed	Check skipped - CodeRabbit’s high-level summary is enabled.
Title check	✅ Passed	The title clearly and concisely describes the documentation typo fixes in the environment variables guide.
Docstring Coverage	✅ Passed	No functions found in the changed files to evaluate docstring coverage. Skipping docstring coverage check. Docstring coverage is scoped to functions touched by this diff. Analyzed 0 functions across 0 files. (1 skipped: 1 unsupported.)
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.

✨ Finishing Touches

🧪 Generate unit tests (beta)

• Create PR with unit tests

---

Thanks for using CodeRabbit! It's free for OSS, and your support helps us grow. If you like it, consider giving us a shout-out.

❤️ Share

• X
• Mastodon
• Reddit
• LinkedIn

_{Comment @coderabbitai help to get the list of available commands.}