Fix typos in comments and documentation

[maxtaran2010]

Fix a few spelling mistakes found by codespell:

• equivalant → equivalent in src/pulling_gauge.rs
• staticly → statically in src/lib.rs and static-metric/src/lib.rs
• recieved → received in static-metric/src/lib.rs
• reccomended → recommended in static-metric/src/lib.rs

Summary by CodeRabbit

• Documentation
  • Corrected several typos and wording issues in crate and API documentation.
  • Improved example text and formatting for clearer, more polished reading.
  • Updated descriptions to use consistent terminology around statically built metrics.

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[ti-chi-bot]

Welcome @maxtaran2010! It looks like this is your first PR to tikv/rust-prometheus 🎉

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The list of commits missing DCO signoff:

• 9abb7d4 Fix typos in comments and documentation

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[coderabbitai]

📝 Walkthrough

Walkthrough

Corrects spelling and formatting errors in crate-level, type-level, and example documentation. No functional code, public declarations, APIs, or behavior changed.

Changes

Documentation corrections

Layer / File(s)	Summary
Rustdoc wording and examples src/lib.rs, src/pulling_gauge.rs, static-metric/src/lib.rs	Corrects spelling errors in crate and PullingGauge documentation, updates the example label text, and fixes surrounding code-fence formatting.

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

🚥 Pre-merge checks | ✅ 5

✅ Passed checks (5 passed)

Check name	Status	Explanation
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	Check skipped - CodeRabbit’s high-level summary is enabled.
Title check	✅ Passed	The title accurately summarizes the change: spelling fixes in comments and documentation.

✨ Finishing Touches

🧪 Generate unit tests (beta)

• Create PR with unit tests

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