Fix overwrite of dashboard quota section

https://github.com/openstack/openstack-manuals/commit/ff672fabd7b0a109807e7b3e9ee300d4ba2ba38e#doc/src/docbkx/openstack-admin-user/src/section_dashboard_set_quotas.xml
accidentally overwrite summer's original commit

This adds the file back.

patchset2 fixes whitespace

Change-Id: Ia8d804d42e5c4cdd796ea07d1ae4f743c2c08638