Use PluginLoader for module docs fragments

library/cloud/rax_files_objects

@@ -17,6 +17,8 @@
 # You should have received a copy of the GNU General Public License
 # along with Ansible.  If not, see <http://www.gnu.org/licenses/>.
 
+# This is a DOCUMENTATION stub specific to this module, it extends
+# a documentation fragment located in ansible.utils.module_docs_fragments
 DOCUMENTATION = '''
 ---
 module: rax_files_objects
@@ -91,7 +93,7 @@ options:
       - meta
     default: file
 author: Paul Durivage
-extends_documentation_fragment: RACKSPACE
+extends_documentation_fragment: rackspace
 '''
 
 EXAMPLES = '''