chore: Re-enable missing-docs lint

[aborgna-q]

#868 didn't actually enable the lints in quantinuum-hugr when the config was moved to the workspace.

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 85.65%. Comparing base (46a7fba) to head (ade4527).

Additional details and impacted files

@@            Coverage Diff             @@
##             main     #876      +/-   ##
==========================================
+ Coverage   85.59%   85.65%   +0.06%     
==========================================
  Files          78       78              
  Lines       14432    14432              
  Branches    14432    14432              
==========================================
+ Hits        12353    12362       +9     
+ Misses       1442     1433       -9     
  Partials      637      637              

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[doug-q]

I think the #[allow(missing_docs)] is dubious. I agree that the existing constructors are ok to not document their fields because they are quasi-documented via the error messages. However these annotations will apply to newly added constuctors.

perhaps adding
#[allow(missing_docs)] // all fields are mentioned in error message per-constructor would be better?

Happy to approve if you think this would be too verbose

[aborgna-q]

I wanted to avoid the boilerplate; but I agree that variants should always have docs.
I moved the attributes to the variants (without the comment though, as that's even more verbose).