[Chore] Check for invalid haddock warnings
Description
Problem: we don't check for -Winvalid-haddock in CI.
Solution: check for them
Related issue(s)
Resolves None
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Tests (see short guidelines)
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If I added new functionality, I added tests covering it. -
If I fixed a bug, I added a regression test to prevent the bug from silently reappearing again.
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