Auto merge of #4710 - steveklabnik:fix-broken-links, r=Mark-Simulacrum
authorbors <bors@rust-lang.org>
Sat, 11 Nov 2017 03:02:03 +0000 (03:02 +0000)
committerbors <bors@rust-lang.org>
Sat, 11 Nov 2017 03:02:03 +0000 (03:02 +0000)
Fix broken links in cargo book

Needed to address failures in https://github.com/rust-lang/rust/pull/45692


Trivial merge