docs(module:editor): fix type any

[wzhudev]

close #4099

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
[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?

Remove any as much as possible in the demo.

Does this PR introduce a breaking change?

[ ] Yes
[x] No

Other information

[netlify]

Deploy preview for ng-zorro-master ready!

Built with commit 7c61229

https://deploy-preview-4105--ng-zorro-master.netlify.com

[codecov]

Codecov Report

Merging #4105 into master will not change coverage.
The diff coverage is n/a.

@@          Coverage Diff           @@
##           master   #4105   +/-   ##
======================================
  Coverage    92.4%   92.4%           
======================================
  Files         506     506           
  Lines       10759   10759           
  Branches     1940    1940           
======================================
  Hits         9942    9942           
  Misses        402     402           
  Partials      415     415

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