Add OpenAPI docs for email verification endpoint

mentioned in merge request api-client!174 (merged)

added 1 deleted label

Codecov Report

Merging #754 into master will increase coverage by 0.00%. The diff coverage is 100.00%.

@@           Coverage Diff           @@
##           master     #754   +/-   ##
=======================================
  Coverage   85.91%   85.91%           
=======================================
  Files         197      197           
  Lines       13207    13208    +1     
=======================================
+ Hits        11347    11348    +1     
  Misses       1860     1860           

Impacted Files	Coverage Δ
arkindex/users/api.py	83.79% <100.00%> (+0.09%)

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mentioned in commit 8dd965f0

merged