docs(Calendar): improve FQA

[pany-ang]

1. 增加文案

或者，你应该采用一种在各个系统和浏览器上兼容性更好的写法：`new Date(2020, 0, 1)`，但是需要注意的是，月份是从 0 开始的。

2. 增加英文 FAQ

[codecov-commenter]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 89.72%. Comparing base (e6031f9) to head (a352446).
Report is 5 commits behind head on main.

Additional details and impacted files

@@            Coverage Diff             @@
##             main   #13062      +/-   ##
==========================================
+ Coverage   89.68%   89.72%   +0.04%     
==========================================
  Files         257      257              
  Lines        6987     6987              
  Branches     1724     1724              
==========================================
+ Hits         6266     6269       +3     
+ Misses        382      380       -2     
+ Partials      339      338       -1     

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[chenjiahan]

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