docs: fix typos in router guides

[gaurav-init]

Fixes a few spelling typos in the router guides. Docs-only, no code changes.

• docs/router/guide/data-loading.md — fullfil → fulfill
• docs/router/guide/type-utilities.md — intension → intention
• docs/router/how-to/use-environment-variables.md — prefered → preferred, libray → library

Summary by CodeRabbit

• Documentation
  • Fixed spelling and grammar errors across router documentation guides, including corrections to terminology and word choices for improved clarity and readability.

[coderabbitai]

No actionable comments were generated in the recent review. 🎉

ℹ️ Recent review info

⚙️ Run configuration

Configuration used: defaults

Review profile: CHILL

Plan: Pro

Run ID: 3819639c-7384-4e9e-a0da-a6a08af432d7

📥 Commits

Reviewing files that changed from the base of the PR and between 279a849 and ce940ee.

📒 Files selected for processing (3)

• docs/router/guide/data-loading.md
• docs/router/guide/type-utilities.md
• docs/router/how-to/use-environment-variables.md

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📝 Walkthrough

Walkthrough

Three single-line typo corrections in router documentation: "fullfil" → "fulfill" in data-loading.md, "intension" → "intention" in type-utilities.md, and "prefered"/"libray" → "preferred"/"library" with a clarified backend reference in use-environment-variables.md.

Changes

Documentation Typo Fixes

Layer / File(s)	Summary
Spelling corrections in router docs docs/router/guide/data-loading.md, docs/router/guide/type-utilities.md, docs/router/how-to/use-environment-variables.md	Corrects "fullfil" → "fulfill" in a code comment, "intension" → "intention" in an introductory sentence, and "prefered"/"libray" → "preferred"/"library" with an added clarification about Tanstack Start server functions.

Estimated code review effort

🎯 1 (Trivial) | ⏱️ ~2 minutes

Suggested labels

documentation

Poem

A rabbit hopped through the docs one day,
And found some words gone spelling-astray.
"Fullfil? Intension? Oh my!" said the hare,
With a flick of the paw and a twitch of care.
Now the letters are tidy, the meaning is clear — 🐇✨

🚥 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 accurately describes the main change—fixing typos across three router documentation files.
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.

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✨ Finishing Touches

🧪 Generate unit tests (beta)

• Create PR with unit tests

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