Doc: Fix module name format

Follow the conventions at
http://qt-project.org/wiki/Spelling_Module_Names_in_Qt_Documentation

Task-number: QTBUG-33360
Change-Id: Ic696e3d0f8f6db6dafe58c3bbfa772f6d9e8c20e
Reviewed-by: Jerome Pasion <jerome.pasion@digia.com>