[Development] documentation: qtwebkit-module.html missing instructions for how to use webkit

[Alan Ezust]

>From this URL:

http://qt-project.org/doc/qt-5.0/qtwebkit-module.html

To include the definitions of the module's classes, use the following directive:
[empty]
To link against the module, add this line to your qmake .pro file:
[empty]

I'd also like to see how to use webkit from QML.