Auto merge of #4462 - behnam:book-fixes, r=alexcrichton
authorbors <bors@rust-lang.org>
Sat, 2 Sep 2017 03:02:48 +0000 (03:02 +0000)
committerbors <bors@rust-lang.org>
Sat, 2 Sep 2017 03:02:48 +0000 (03:02 +0000)
commit8ee43410be7d45384be735ac42570ca6d9c74622
tree19e7b194a0025d7b4a1c61811f76f91aa4bfb518
parent34c0674a251287c94cdd1a112966bcb9010c62e8
parentff6cbadee69380caa81a97fdee7568ef5c737be6
Auto merge of #4462 - behnam:book-fixes, r=alexcrichton

[doc/book] Drop reference/policies.md and small fixes

We don't need to put `policies.md` in the book. See
<https://github.com/rust-lang/crates.io/issues/1030> for more.

Renaming `introduction.md` to `index.md` prevents creating two html
files (and URL) for one source.

The rest are small styling issues.

Tracker: <https://github.com/rust-lang/cargo/issues/4040>