Update quick_start_guide.md

Author: John Dickinson
Original pull request can be found here:
https://github.com/gluster/gluster-swift/pull/2

Change-Id: Id5cd45e7090f69407938e5f9431560ed0977b22d
Signed-off-by: Prashanth Pai <ppai@redhat.com>
Reviewed-on: http://review.gluster.org/7234
Reviewed-by: Thiago da Silva <thiago@redhat.com>
Reviewed-by: Luis Pabon <lpabon@redhat.com>
Tested-by: Luis Pabon <lpabon@redhat.com>