Fix some synctactic markup errors
Fix some synctactic markup errors

This patch fix some rst hyperlink markup syntactic errors
in the README.rst.I am sorry for my patch:
'https://review.openstack.org/#/c/421292/' result in
this bug.

Change-Id: I1157e581211100e592d71df97911264ed3d68a59

openstack/freezer-web-ui,openstack/freezer-web-ui,openstack/freezer-web-ui,openstack/freezer-web-ui