Trivial: Remove duplicated line in man page

Tang Chen · Tang Chen · commit 55466d8158d7 · 2016-06-02T12:19:08.000+08:00
Change-Id: I3f72308e639ddcdfb0289e50f9bafd097461c896
diff --git a/doc/source/man/openstack.rst b/doc/source/man/openstack.rst
@@ -96,9 +96,6 @@ OPTIONS
 :option:`--os-user-domain-name` <auth-user-domain-name> | :option:`--os-user-domain-id` <auth-user-domain-id>
     Domain name or ID containing user
 
-:option:`--os-user-domain-name` <auth-user-domain-name> | :option:`--os-user-domain-id` <auth-user-domain-id>
-    Domain name or ID containing user
-
 :option:`--os-trust-id` <trust-id>
     ID of the trust to use as a trustee user
 
