Fix #11015 with a nice note.
Fix #11015 with a nice note.

Signed-off-by: Edward Z. Yang <ezyang@cs.stanford.edu>

Test Plan: doc only

Reviewers: bgamari, austin

Subscribers: thomie

Differential Revision: https://phabricator.haskell.org/D1776

GHC Trac Issues: #11015

(cherry picked from commit 91f1c600614e8c456a62bd95611400b442113cdf)

GaloisInc/halvm-ghc,GaloisInc/halvm-ghc,GaloisInc/halvm-ghc,GaloisInc/halvm-ghc,GaloisInc/halvm-ghc,GaloisInc/halvm-ghc,GaloisInc/halvm-ghc