Add reload() in docs for Container and Secret classes

Signed-off-by: Joffrey F <joffrey@docker.com>

docs/change-log.md

 Change log
 ==========
 
+2.2.1
+-----
+
+[List of PRs / issues for this release](https://github.com/docker/docker-py/milestone/32?closed=1)
+
+### Bugfixes
+
+* Fixed a bug where the `status_code` attribute of `APIError` exceptions would
+  not reflect the expected value.
+* Fixed an issue where the `events` method would time out unexpectedly if no
+  data was sent by the engine for a given amount of time.
+
+
 2.2.0
 -----
 

docs/containers.rst

@@ -40,6 +40,7 @@ Container objects
   .. automethod:: logs
   .. automethod:: pause
   .. automethod:: put_archive
+  .. automethod:: reload
   .. automethod:: remove
   .. automethod:: rename
   .. automethod:: resize

docs/secrets.rst

@@ -26,4 +26,5 @@ Secret objects
 
     The raw representation of this object from the server.
 
+  .. automethod:: reload
   .. automethod:: remove