Updated openstack/openstack
Project: openstack/glance  75fbece42271c0994b00b50734616675de140885

fixed typos found by RETF rules in RST files

rules are avaialble at
https://en.wikipedia.org/wiki/Wikipedia:AutoWikiBrowser/Typos

Change-Id: I725d3892d915bf880e62b8b11b97dcfc0a804a41