Navigation components doc tweaks

[aaroncawte]

🤔 This is a ...

• New feature
• Bug fix
• Site / document update
• Component style update
• TypeScript definition update
• Refactoring
• Code style optimization
• Test Case
• Branch merge
• Other (about what?)

🔗 Related issue link

N/A

💡 Background and solution

Spelling and grammar improvements to English language documentation.

📝 Changelog

No new features.

Language	Changelog
🇺🇸 English
🇨🇳 Chinese

☑️ Self Check before Merge

• Doc is updated/provided or not needed
• Demo is updated/provided or not needed
• TypeScript definition is updated/provided or not needed
• Changelog is provided or not needed

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View rendered components/affix/index.en-US.md
View rendered components/dropdown/index.en-US.md
View rendered components/menu/index.en-US.md
View rendered components/page-header/index.en-US.md
View rendered components/pagination/index.en-US.md
View rendered components/steps/index.en-US.md

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[codecov]

Codecov Report

Merging #19447 into master will not change coverage.
The diff coverage is n/a.

@@           Coverage Diff           @@
##           master   #19447   +/-   ##
=======================================
  Coverage    97.8%    97.8%           
=======================================
  Files         282      282           
  Lines        7638     7638           
  Branches     2109     2109           
=======================================
  Hits         7470     7470           
  Misses        168      168

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