Fix tanh typo for rvv.

[zhangyang2057]

No description provided.

[tencent-adm]

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[codecov-commenter]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 94.51%. Comparing base (3752d71) to head (622fbae).
Report is 3 commits behind head on master.

Additional details and impacted files

@@           Coverage Diff           @@
##           master    #5584   +/-   ##
=======================================
  Coverage   94.51%   94.51%           
=======================================
  Files         787      787           
  Lines      248718   248718           
=======================================
  Hits       235084   235084           
  Misses      13634    13634           

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[nihui]

Thanks for your contribution !