docs: update introduce of en-US, syncing with zh-CN

[yoshigion]

This is a ...

• [* ] Site / document update

What's the background?

1. Describe the source of requirement.

English version document correction.

2. Resolve what problem.

Correct differences of the document between Chinese and English version.

3. Related issue link.

No issue link.

Self Check before Merge

• [*] Doc is not needed
• [*] Demo is not needed
• [*] TypeScript definition is not needed
• [*] Changelog is not needed

[codecov]

Codecov Report

Merging #1802 into master will not change coverage.
The diff coverage is n/a.

@@           Coverage Diff           @@
##           master    #1802   +/-   ##
=======================================
  Coverage   88.06%   88.06%           
=======================================
  Files         157      157           
  Lines        5422     5422           
  Branches     1525     1525           
=======================================
  Hits         4775     4775           
  Misses        578      578           
  Partials       69       69

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[github-actions]

This pull request has been automatically locked since there has not been any recent activity after it was closed. Please open a new issue for related bugs.