📕docs: replace text zod with valibot in migration guides

[Maicarons]

Hello developer,

Im learning the great project and found a mistake in docs.
Thanks for your elysiajs & have a good day.

Maicarons

Summary by CodeRabbit

• Documentation
  • Updated Fastify and tRPC migration guides with Valibot validation examples, providing developers with validation library alternatives and comprehensive guidance for application migration to Elysia.

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[coderabbitai]

Walkthrough

Two migration documentation pages are updated to replace Zod validation library examples with Valibot equivalents, changing imports and validator usage in the code snippets for Fastify and tRPC migration guides without altering surrounding logic or routing behavior.

Changes

Cohort / File(s)	Summary
Validation Library Documentation Updates docs/migrate/from-fastify.md, docs/migrate/from-trpc.md	Replace Zod validation library with Valibot in migration example code snippets; update import statements and validator object references to match Valibot API

Estimated code review effort

🎯 1 (Trivial) | ⏱️ ~3 minutes

• Both changes follow the same homogeneous pattern (Zod → Valibot library swap)
• Documentation-only updates with no logic or control flow changes
• Simple import and reference replacements in isolated code examples

Possibly related PRs

• Replace zod on valibot example #620: Performs the same code-level change—swap Zod for Valibot in documentation validation examples across different migration pages
• Fix valibot import in hono migration docs #636: Modifies migration documentation examples to replace Zod imports with Valibot, fixing Valibot usage consistency in documentation

Poem

🐰 With Valibot's gentle nibble, we validate with glee,
Zod's past now, fresh examples bloom in our docs tree,
From Fastify to tRPC, the migration's crystal clear,
One validator's out, another hops right here! 🎉

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: replacing Zod with Valibot in migration guide documentation.
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 57a6ffc and 566a782.

📒 Files selected for processing (2)

• docs/migrate/from-fastify.md (1 hunks)
• docs/migrate/from-trpc.md (1 hunks)

🔇 Additional comments (2)

docs/migrate/from-fastify.md (1)

337-354: Valibot example is correct and well-integrated.

The Valibot validation example correctly replaces Zod while maintaining consistency with the TypeBox example above it. The import statement and validator API usage (v.object(), v.number(), v.string()) are accurate.

docs/migrate/from-trpc.md (1)

331-348: Valibot example is correct and mirrors the Fastify migration guide.

The Valibot validation example properly replaces Zod with the correct import and validator API usage. Changes are consistent with the parallel update in docs/migrate/from-fastify.md.

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