Fix typo in documentation of Data.Functor.($>)

Signed-off-by: Herbert Valerio Riedel <hvr@gnu.org>
Tweak Haddock markup in Control.Applicative

This (arguably) improves rendering with Haddock 2.14

Signed-off-by: Herbert Valerio Riedel <hvr@gnu.org>
Minor fixes to Haddock markup

Signed-off-by: Herbert Valerio Riedel <hvr@gnu.org>