Path should be client.ui not ui.client in documentation

http://morevaadin.com/content/using-gwt-widgets-part-1/ is still one of the first things found when searching integration of vaadin and gwt. Still there is a little typo that mixes up the subfolder namespace compared to the source code example. Can you please fix this, It took me like a day to find.

(and thanks of course for the wondervoll tutorial)

[nfrankel]

Articles are already on Github. I welcome any pull request :-)