Ben Gamari authored 9 years ago and Ben Gamari committed 9 years ago

Various people (myself included) have complained about the lack of
useful descriptions for the various packages included in GHC's source
tree. Fix this.

Test Plan: Validate

Reviewers: austin, thomie

Reviewed By: thomie

Subscribers: angerman, ezyang

Differential Revision: https://phabricator.haskell.org/D1736