Auto merge of #2411 - sbeckeriv:cargo-cache-doc-update-1609, r=alexcrichton
authorbors <bors@rust-lang.org>
Thu, 25 Feb 2016 17:39:25 +0000 (17:39 +0000)
committerbors <bors@rust-lang.org>
Thu, 25 Feb 2016 17:39:25 +0000 (17:39 +0000)
Per https://github.com/rust-lang/cargo/issues/1609 "clarify how the cache works"

Added in a single line that states that the cached packages are only
removed by running the clean command.

Please let me know if this is the wrong spot, incorrect information or just silly.
Thanks
becker


Trivial merge