docs(module:table): update multiple-sorter.ts

[notthewaquar]

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• 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
[x] 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

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[codecov]

Codecov Report

Merging #7353 (d7e4be4) into master (b517bd4) will not change coverage.
The diff coverage is n/a.

@@           Coverage Diff            @@
##           master    #7353    +/-   ##
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  Coverage   91.62%   91.62%            
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  Files         487      487            
  Lines       16013    16013            
  Branches     2604     2470   -134     
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  Hits        14672    14672            
  Misses       1027     1027            
  Partials      314      314            

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[simplejason]

This is the expected behavior, we expect name not to be sorted. Reference is made to ant-design demo.
The correct behavior should be to hide the sort button when there is no sort(nzSortFn & nzSortPriority)