Minor reformatting and edits of Haddock documentation #3450

Job	Run time
Pedantic	4m 47s
Unit tests (ubuntu-latest)	2m 1s
Unit tests (ubuntu-latest, alpine, --docker --system-ghc --no-install-ghc --flag stack:static)	4m 59s
Unit tests (windows-latest)	4m 50s
Unit tests (macos-latest)	17m 11s
	33m 48s

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