thomasw authored Nov 10, 2016 and Ben Gamari committed Nov 10, 2016

D2490 added support for type wildcards in TH pattern splices. The user's
guide still said that they were not supported, this patch fixes this.

Test Plan: build documentation

Reviewers: goldfire, austin, mvv, bgamari

Reviewed By: bgamari

Subscribers: thomie

Differential Revision: https://phabricator.haskell.org/D2686

GHC Trac Issues: #12164