Merge pull request #22743 from yongtang/05142016-typo-in-work-with-networks

Fix a typo in work-with-networks.md
(cherry picked from commit e333675cd783f3e5e208fefbf71528ed643b9e1c)

Signed-off-by: Sebastiaan van Stijn <github@gone.nl>

docs/userguide/networking/work-with-networks.md

@@ -289,7 +289,7 @@ examine its networking stack:
 $ docker attach container2
 ```
 
-If you look a the container's network stack you should see two Ethernet interfaces, one for the default bridge network and one for the `isolated_nw` network.
+If you look at the container's network stack you should see two Ethernet interfaces, one for the default bridge network and one for the `isolated_nw` network.
 
 ```bash
 / # ifconfig