docs: 补充微信支付公钥文档相关说明

[yansongda]

fix: #1046

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[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 97.43%. Comparing base (7d6430e) to head (8c9fdb4).
Report is 1 commits behind head on master.

Additional details and impacted files

@@            Coverage Diff            @@
##             master    #1047   +/-   ##
=========================================
  Coverage     97.43%   97.43%           
  Complexity     1034     1034           
=========================================
  Files           375      375           
  Lines          6859     6859           
=========================================
  Hits           6683     6683           
  Misses          176      176           

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[puzzle9]

看了半天 竟然是一个文档描述的事情 我曾以为是需要改代码 调用接口来实现的