Editorial: improve async attribute description


Fixes #4171.
commit2b1c10493d3a6f726aa1bcc032eee161ffd3f960
parent1d6eb9933701ea65f7a9dd670d37a2faa17b8f12
git2b1c10493d3a6f726aa1bcc032eee161ffd3f960
authorSidak Singh Aulakh <sidakaulakh@gmail.com>
committerAnne van Kesteren <annevk@annevk.nl>
commit timeMon, 11 Feb 2019 09:36:58 +0100