fix: best-practice typo

[lumore]

Hey!

I'm not sure if this type of PRs are welcomed, but I noticed a typo in docs.

I'm just getting started with Elysia and loving it so far, thanks for the great work.

Summary by CodeRabbit

• Documentation
  • Corrected grammatical error in best practices guidance documentation.

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[coderabbitai]

Walkthrough

A single grammatical correction in the documentation: "Treat an Elysia instance is a controller" was changed to "Treat an Elysia instance as a controller" in the best-practice guidance file.

Changes

Cohort / File(s)	Summary
Documentation grammar correction docs/essential/best-practice.md	Fixed grammatical error: changed "is a controller" to "as a controller" in guidance text

Estimated code review effort

🎯 1 (Trivial) | ⏱️ ~1 minute

Possibly related PRs

• docs: fix tyops, improve grammar in best-practice.md #615: Editorial corrections to docs/essential/best-practice.md with broader grammar and style improvements

Poem

A word slips by, but not for long,
When rabbit reviewers spot what's wrong—
"Is" becomes "as," the fix is clean,
Grammar gleams where blur had been! ✨

Pre-merge checks and finishing touches

✅ Passed checks (3 passed)

Check name	Status	Explanation
Description Check	✅ Passed	Check skipped - CodeRabbit’s high-level summary is enabled.
Title check	✅ Passed	The title accurately describes the main change: fixing a typo in the best-practice documentation file.
Docstring Coverage	✅ Passed	No functions found in the changed files to evaluate docstring coverage. Skipping docstring coverage check.

✨ Finishing touches

🧪 Generate unit tests (beta)

• Create PR with unit tests
• Post copyable unit tests in a comment

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📜 Recent review details

Configuration used: CodeRabbit UI

Review profile: CHILL

Plan: Pro

📥 Commits

Reviewing files that changed from the base of the PR and between 1e443d3 and e6fb811.

📒 Files selected for processing (1)

• docs/essential/best-practice.md (1 hunks)

🔇 Additional comments (1)

docs/essential/best-practice.md (1)

165-165: Grammar fix is correct and improves clarity.

Changing "is" to "as" corrects a grammatical error and aligns the sentence with the proper English idiom "Treat X as Y." This improves readability and clarity for documentation users.

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