Update index.en-US.md

[renny-ren]

fix grammar

[中文版模板 / Chinese template]

🤔 This is a ...

• New feature
• Bug fix
• Site / documentation update
• Demo update
• Component style update
• TypeScript definition update
• Bundle size optimization
• Performance optimization
• Enhancement feature
• Internationalization
• Refactoring
• Code style optimization
• Test Case
• Branch merge
• Other (about what?)

🔗 Related issue link

💡 Background and solution

📝 Changelog

Language	Changelog
🇺🇸 English	Fix English grammar
🇨🇳 Chinese

☑️ Self Check before Merge

⚠️ Please check all items below before review. ⚠️

• 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

---

View rendered components/affix/index.en-US.md

---

View rendered components/select/index.en-US.md

[ant-design-bot]

[codecov]

Codecov Report

Merging #29234 (1507d4f) into master (f77a9ac) will not change coverage.
The diff coverage is n/a.

@@            Coverage Diff            @@
##            master    #29234   +/-   ##
=========================================
  Coverage   100.00%   100.00%           
=========================================
  Files          394       394           
  Lines         7478      7478           
  Branches      2134      2134           
=========================================
  Hits          7478      7478           

---

Continue to review full report at Codecov.

Legend - Click here to learn more
Δ = absolute <relative> (impact), ø = not affected, ? = missing data
Powered by Codecov. Last update f77a9ac...add6133. Read the comment docs.

[codesandbox-ci]

This pull request is automatically built and testable in CodeSandbox.

To see build info of the built libraries, click here or the icon next to each commit SHA.

Latest deployment of this branch, based on commit add6133:

Sandbox	Source
antd reproduction template	Configuration