fix dropped AvroType @doc annotations

[clairemcginty]

See #5875

[codecov]

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 61.52%. Comparing base (fa8039f) to head (b143f26).
⚠️ Report is 2 commits behind head on main.

Additional details and impacted files

@@           Coverage Diff           @@
##             main    #5879   +/-   ##
=======================================
  Coverage   61.52%   61.52%           
=======================================
  Files         317      317           
  Lines       11663    11663           
  Branches      836      869   +33     
=======================================
  Hits         7176     7176           
  Misses       4487     4487           

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