Update release notes for type sigs in TH patterns patch
Update release notes for type sigs in TH patterns patch

[skip ci]

ezyang/ghc,mettekou/ghc,shlevy/ghc,shlevy/ghc,mettekou/ghc,ezyang/ghc,mettekou/ghc,olsner/ghc,mettekou/ghc,ezyang/ghc,sdiehl/ghc,olsner/ghc,olsner/ghc,sdiehl/ghc,olsner/ghc,shlevy/ghc,sdiehl/ghc,mettekou/ghc,ezyang/ghc,sdiehl/ghc,shlevy/ghc,sdiehl/ghc,shlevy/ghc,shlevy/ghc,ezyang/ghc,olsner/ghc,olsner/ghc,ezyang/ghc,sdiehl/ghc,olsner/ghc,mettekou/ghc,mettekou/ghc,sdiehl/ghc,ezyang/ghc,shlevy/ghc