fix(module: grid): change API OnClick to onClick

[fisherspy]

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-mobile/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?

[x] 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?

[x] Yes
[ ] No

Other information

[codecov]

Codecov Report

Merging #394 into master will increase coverage by 0.05%.
The diff coverage is 100%.

@@            Coverage Diff             @@
##           master     #394      +/-   ##
==========================================
+ Coverage   89.31%   89.36%   +0.05%     
==========================================
  Files         320      320              
  Lines        7093     7093              
  Branches      568      568              
==========================================
+ Hits         6335     6339       +4     
+ Misses        587      583       -4     
  Partials      171      171

Impacted Files	Coverage Δ
components/grid/grid.component.ts	94.11% <100%> (ø)	⬆️
components/picker/picker.component.ts	81.97% <0%> (+1.74%)	⬆️
components/picker/picker.service.ts	94.44% <0%> (+5.55%)	⬆️

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