Auto merge of #5563 - ehuss:cargotest-doc, r=alexcrichton
authorbors <bors@rust-lang.org>
Thu, 24 May 2018 05:55:01 +0000 (05:55 +0000)
committerbors <bors@rust-lang.org>
Thu, 24 May 2018 05:55:01 +0000 (05:55 +0000)
cargotest: Add some more docs

Hopefully this isn't too wordy.  This isn't intended for rustdoc output, but generally to be read in-editor.


Trivial merge