docs(Overlay): fix the misleading overlay example

[pany-ang]

使该示例正确表达：点击嵌入内容不会关闭遮罩层，点击空白区域可以

[pany-ang]

CI / test (pull_request) 报错似乎有点无厘头，像是 Vitest 抽风，可以尝试重新执行试试。

[codecov-commenter]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 89.70%. Comparing base (ec5b45b) to head (d68d311).
Report is 61 commits behind head on main.

Additional details and impacted files

@@            Coverage Diff             @@
##             main   #13399      +/-   ##
==========================================
+ Coverage   89.60%   89.70%   +0.09%     
==========================================
  Files         257      257              
  Lines        7013     7020       +7     
  Branches     1736     1738       +2     
==========================================
+ Hits         6284     6297      +13     
+ Misses        384      382       -2     
+ Partials      345      341       -4     

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[chenjiahan]

Thank you!