Doc: Qt Quick: Fix module name format (Pt 1/2)

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



Attempt to differentiate between the whole module ("Qt Quick") and the
QML import ("QtQuick") by encoding the latter with monospace font. There
are places in the text where both representations are valid.

Change-Id: Id6e157a4191aaa4e23a9cd5c76abfe902fe43d33
Reviewed-by: Jerome Pasion <jerome.pasion@digia.com>