Update index.en-US.md

[asroor]

PR Checklist

Please check if your PR fulfills the following requirements:

• [ ] The commit message follows our guidelines: https://github.com/NG-ZORRO/ng-zorro-antd/blob/master/CONTRIBUTING.md#commit
• [ ] Tests for the changes have been added (for bug fixes / features)
• [ ] Docs have been added / updated (for bug fixes / features)

PR Type

What kind of change does this PR introduce?

[ ] Bugfix
[ ] Feature
[ ] Code style update (formatting, local variables)
[ ] Refactoring (no functional changes, no api changes)
[ ] Build related changes
[ ] CI related changes
[ ] Documentation content changes
[ ] Application (the showcase website) / infrastructure changes
[ ] Other... Please describe:

What is the current behavior?

Issue Number: N/A

What is the new behavior?

Does this PR introduce a breaking change?

[ ] Yes
[ ] No

Other information

[zorro-bot[bot]]

This preview will be available after the AzureCI is passed.

[codecov[bot]]

Codecov Report

All modified and coverable lines are covered by tests :white_check_mark:

Project coverage is 91.57%. Comparing base (81ef077) to head (890eb9d).

Additional details and impacted files

@@            Coverage Diff             @@
##           master    #8531      +/-   ##
==========================================
- Coverage   91.57%   91.57%   -0.01%     
==========================================
  Files         533      533              
  Lines       18336    18336              
  Branches     2801     2801              
==========================================
- Hits        16792    16791       -1     
- Misses       1226     1227       +1     
  Partials      318      318              

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[OriginRing]

I didn't see any changes to the specific file contents, you can double check that PR,closed for now.