scheduler options and block storage admin link fixed

reference bug https://bugs.launchpad.net/openstack-manuals/+bug/1212862 for the final solution to the two scheduler pages under config and compute admin being out of synch. Both these pages no longer have references to the compute volume scheduler and a now have a link to the block storage admin guide

bug 1193432
Change-Id: I1daf2f3469eb64d90ebd2a5f286508da21167b70
Merge "scheduler options and block storage admin link fixed"