Fixed missing / in replace-brick pause example

BUG: 1155421
Change-Id: I079f738e8381bada4595d3600921a39581edaea7
Signed-off-by: Joe Julian <me@joejulian.name>
Reviewed-on: http://review.gluster.org/8963
Reviewed-by: Humble Devassy Chirammal <humble.devassy@gmail.com>
Tested-by: Gluster Build System <jenkins@build.gluster.com>