Remove Nova object store service

As of I8bf7cbaa7015bb61656ab90ccc8f944aaeebb095, Nova
removed the n-obj service, so we should cleanup

Change-Id: I7db3796a6448decb4ac5e66d980f487c7d1f394e
diff --git a/doc/source/stackrc.rst b/doc/source/stackrc.rst
index b21f74f..81d4b80 100644
--- a/doc/source/stackrc.rst
+++ b/doc/source/stackrc.rst
@@ -20,7 +20,7 @@
 
     ::
 
-        ENABLED_SERVICES=g-api,g-reg,key,n-api,n-crt,n-obj,n-cpu,n-net,n-cond,c-sch,c-api,c-vol,n-sch,n-cauth,horizon,rabbit,tempest,$DATABASE_TYPE
+        ENABLED_SERVICES=g-api,g-reg,key,n-api,n-crt,n-cpu,n-net,n-cond,c-sch,c-api,c-vol,n-sch,n-cauth,horizon,rabbit,tempest,$DATABASE_TYPE
 
     Other services that are not enabled by default can be enabled in
     ``localrc``. For example, to add Swift, use the following service