docs: unify title capitalization style

[chenjiahan]

Summary

Added our writing style guide:

• Capitalization style: page titles and section headings should use sentence-style capitalization (only capitalize the first word and proper nouns) rather than title-style capitalization:
  • Correct: "A new method for creating JavaScript rollovers"
  • Incorrect: "A New Method for Creating JavaScript Rollovers"

Reference

Wikipedia

Capitalize the initial letter (except in rare cases, such as eBay), but otherwise follow sentence case, not title case.

https://en.wikipedia.org/wiki/Wikipedia:Manual_of_Style#Article_titles,_sections,_and_headings

Microsoft Writing Style Guide

In general, use sentence-style casing (that is, only capitalize the first word of a title, like at the beginning of a sentence), as this makes content more readable and ensures better localizability.

https://learn.microsoft.com/en-us/style-guide/text-formatting/formatting-titles

MDN

Page titles and section headings should use sentence-style capitalization (only capitalize the first word and proper nouns) rather than headline-style capitalization.

https://developer.mozilla.org/en-US/docs/MDN/Writing_guidelines/Writing_style_guide#titles

WordPress

In most cases, sentence-case capitalization is used.

https://github.com/WordPress/WordPress-Documentation-Style-Guide/blob/main/docs/3-language-grammar/capitalization.md#title-case-capitalization

Checklist

• Tests updated (or not required).
• Documentation updated (or not required).

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