cli: fix descriptions of owner-uid and owner-gid

Change-Id: I04c0dd23bc5bc34fd9d7bddb11beeecb8e7e2a49
BUG: 853842
Signed-off-by: Shireesh Anjal <sanjal@redhat.com>
Reviewed-on: http://review.gluster.org/4398
Reviewed-by: Anand Avati <avati@redhat.com>
Tested-by: Anand Avati <avati@redhat.com>