Show different content error for comments mode

[acelaya]

As part of the testing process of hypothesis/bouncer#909, it was discovered the content error uses the "annotations" wording even when comments mode is enabled.

This PR changes that to make sure it talks about comments instead.

[codecov]

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 99.50%. Comparing base (294e8ec) to head (bdde4e9).
⚠️ Report is 1 commits behind head on main.

Additional details and impacted files

@@           Coverage Diff           @@
##             main    #7441   +/-   ##
=======================================
  Coverage   99.50%   99.50%           
=======================================
  Files         271      271           
  Lines       11018    11024    +6     
  Branches     2652     2658    +6     
=======================================
+ Hits        10963    10969    +6     
  Misses         55       55           

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