Recent work has concluded adding OpenStack Release Manager
permissions explicitly to all openstack/ namespace projects with the
addition of inheritance from openstack/meta-config in their
individual ACLs. This made the earlier Release Manager permissions
in our global configuration redundant, so it's being removed. The
cleanup is done by hand due to how global configuration is managed
in Gerrit's All-Projects metaproject, but we're updating our
documentation to reflect it.
While here, clean up obsolete references to API-Projects inheritance
and stable/.* branch permissions which we've not applied for some
years now.
Change-Id: Ib9314f7a1deb3d343eb2d9b476064de41186f57a
b87e938a13