Reorganize key_manager docs

This change organizes the key_manager docs by topic rather than letting
autodoc organize methods by the order they appear in the _proxy.py file.

Change-Id: I9caefcd9d1847da6689f6680fb420a9ea41a1c93

doc/source/users/proxies/key_manager.rst

@@ -14,5 +14,38 @@ The key_management high-level interface is available through the
 object.  The ``key_manager`` member will only be added if the service is
 detected.
 
+Secret Operations
+^^^^^^^^^^^^^^^^^
+
 .. autoclass:: openstack.key_manager.v1._proxy.Proxy
-   :members:
+
+   .. automethod:: openstack.key_manager.v1._proxy.Proxy.create_secret
+   .. automethod:: openstack.key_manager.v1._proxy.Proxy.update_secret
+   .. automethod:: openstack.key_manager.v1._proxy.Proxy.delete_secret
+   .. automethod:: openstack.key_manager.v1._proxy.Proxy.get_secret
+   .. automethod:: openstack.key_manager.v1._proxy.Proxy.find_secret
+   .. automethod:: openstack.key_manager.v1._proxy.Proxy.secrets
+
+Container Operations
+^^^^^^^^^^^^^^^^^^^^
+
+.. autoclass:: openstack.key_manager.v1._proxy.Proxy
+
+   .. automethod:: openstack.key_manager.v1._proxy.Proxy.create_container
+   .. automethod:: openstack.key_manager.v1._proxy.Proxy.update_container
+   .. automethod:: openstack.key_manager.v1._proxy.Proxy.delete_container
+   .. automethod:: openstack.key_manager.v1._proxy.Proxy.get_container
+   .. automethod:: openstack.key_manager.v1._proxy.Proxy.find_container
+   .. automethod:: openstack.key_manager.v1._proxy.Proxy.containers
+
+Order Operations
+^^^^^^^^^^^^^^^^
+
+.. autoclass:: openstack.key_manager.v1._proxy.Proxy
+
+   .. automethod:: openstack.key_manager.v1._proxy.Proxy.create_order
+   .. automethod:: openstack.key_manager.v1._proxy.Proxy.update_order
+   .. automethod:: openstack.key_manager.v1._proxy.Proxy.delete_order
+   .. automethod:: openstack.key_manager.v1._proxy.Proxy.get_order
+   .. automethod:: openstack.key_manager.v1._proxy.Proxy.find_order
+   .. automethod:: openstack.key_manager.v1._proxy.Proxy.orders