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: I51f23e4b3ac0dffe8fef674f2cb431776d5829ab
Reviewed-by: Alex Blasche <alexander.blasche@digia.com>
Reviewed-by: Jerome Pasion <jerome.pasion@digia.com>