Doc: updated ApplicationWindow.qml according to writing guidelines.
Doc: updated ApplicationWindow.qml according to writing guidelines.

Change-Id: I4df1825fdeb99c46e143e7f3065f2d77f45b26ae
Reviewed-by: Jerome Pasion <c10995d24f6b454503389e8d00d837aef038985d@digia.com>
Reviewed-by: J-P Nurmi <b84a892f57a298bb5dae653b4e188948a84d5549@digia.com>

jfaust/qtquickcontrols,kobolabs/qtquickcontrols,richardmg/qtcomponents,kobolabs/qtquickcontrols,richardmg/qtcomponents,jfaust/qtquickcontrols,jfaust/qtquickcontrols,mizukusak/qtquickcontrols,richardmg/qtcomponents,drgvond/qtquickcontrols,kobolabs/qtquickcontrols,mizukusak/qtquickcontrols,mizukusak/qtquickcontrols,drgvond/qtquickcontrols,drgvond/qtquickcontrols