Multiple Haddock comments for a single entity are not allowed

Summary

The following spans give rise to "Multiple Haddock comments for a single entity are not allowed" warnings when compiled with ghc options -haddock -Winvalid-haddock with build compiler ghc-9.2.1

GHC/Unit/Module/Deps.hs:270:49
Language/Haskell/Syntax/Decls.hs:449:9
Language/Haskell/Syntax/Decls.hs:1386:5
Language/Haskell/Syntax/Expr.hs:1685:33
GHC/Hs/Pat.hs:235:7
GHC/Hs.hs:116:6

Edited Jan 11, 2022 by Shayne Fletcher

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