Auto merge of #4528 - adrian5:patch-1, r=alexcrichton
authorbors <bors@rust-lang.org>
Sat, 23 Sep 2017 04:25:35 +0000 (04:25 +0000)
committerbors <bors@rust-lang.org>
Sat, 23 Sep 2017 04:25:35 +0000 (04:25 +0000)
Fix typo in doc


Trivial merge