Auto merge of #2690 - hatsunearu:hatsunearu-patch-1, r=alexcrichton
authorbors <bors@rust-lang.org>
Sun, 15 May 2016 01:08:35 +0000 (18:08 -0700)
committerbors <bors@rust-lang.org>
Sun, 15 May 2016 01:08:35 +0000 (18:08 -0700)
Update manpage with some missing cargo commands

the manpage of cargo is missing a few important cargo commands, and I've added `rustc` and `help`. Hopefully everything's alright.


Trivial merge