Auto merge of #4272 - behnam:doc, r=alexcrichton
authorbors <bors@rust-lang.org>
Wed, 12 Jul 2017 09:04:18 +0000 (09:04 +0000)
committerbors <bors@rust-lang.org>
Wed, 12 Jul 2017 09:04:18 +0000 (09:04 +0000)
[doc/crates-io] Add text about packaging tests/benches

Fixes <https://github.com/rust-lang/cargo/issues/4262>


Trivial merge