doc: Update manpages

Change-Id: Id14c7c3229ed266cd15915a2136e3290ce2c5ed2
BUG: 1031328
Signed-off-by: Harshavardhana <harsha@harshavardhana.net>
Reviewed-on: http://review.gluster.org/7338
Reviewed-by: Lalatendu Mohanty <lmohanty@redhat.com>
Reviewed-by: Vijay Bellur <vbellur@redhat.com>
Tested-by: Vijay Bellur <vbellur@redhat.com>