Merge pull request #2259 from p1100i/patch-1

Fix `network_mode` API documentation wording

docker/api/container.py

@@ -512,7 +512,7 @@ class ContainerApiMixin(object):
             network_mode (str): One of:
 
                 - ``bridge`` Create a new network stack for the container on
-                  on the bridge network.
+                  the bridge network.
                 - ``none`` No networking for this container.
                 - ``container:<name|id>`` Reuse another container's network
                   stack.