Fix mention of foldl' in Haddocks of unions/unionsWith#832
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amesgen wants to merge 1 commit intohaskell:masterfrom
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Fix mention of `foldl'` in Haddocks of `unions`/`unionsWith`#832amesgen wants to merge 1 commit intohaskell:masterfrom
amesgen wants to merge 1 commit intohaskell:masterfrom