update link to api_check.py

[felixzinn]

The link to the api_check.py file in the documentation is updated. Fix #167

[codecov-commenter]

Codecov Report

All modified and coverable lines are covered by tests ✅

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Additional details and impacted files

@@           Coverage Diff           @@
##             main     #170   +/-   ##
=======================================
  Coverage        ?   92.26%           
=======================================
  Files           ?       26           
  Lines           ?     1267           
  Branches        ?        0           
=======================================
  Hits            ?     1169           
  Misses          ?       98           
  Partials        ?        0           

Flag	Coverage Δ
unittests	92.34% <ø> (?)

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[jonas-eschle]

Looks good, thanks for the quick fix! Btw, if you want to be more involved in hepstats or any other Scikit-HEP package, just ping me, i.e. on Mattermost ;)