[chore] Replace checkdoc by checkfile

[mackjmr]

Description:
Follow up to: open-telemetry/opentelemetry-go-build-tools#348

Link to tracking Issue: (open-telemetry/opentelemetry-go-build-tools#349)

[codecov]

Codecov Report

Patch coverage has no change and project coverage change: +0.03% 🎉

Comparison is base (3089ea8) 90.25% compared to head (cd59abe) 90.29%.

Additional details and impacted files

@@            Coverage Diff             @@
##             main    #8144      +/-   ##
==========================================
+ Coverage   90.25%   90.29%   +0.03%     
==========================================
  Files         301      301              
  Lines       15551    15551              
==========================================
+ Hits        14035    14041       +6     
+ Misses       1227     1222       -5     
+ Partials      289      288       -1     

see 1 file with indirect coverage changes

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