Changed Availability section of ceph-mds.rst to reference ceph-mds, not ceph-mon.
Signed-off-by: James Ryan Cresawn <jrcresawn@gmail.com>
Merge pull request #1399 from jrcresawn/docfix

Changed Availability section of ceph-mds.rst to reference ceph-mds, not ...

Reviewed-by: Sage Weil <sage@inktank.com>