Doc: Fixed QCH listings for Qt QML and Qt Quick Dialogs

Qt QML: added QML types page as a child in the list
Qt Quick Dialogs: "manual" as type taken out

Change-Id: I95d77b7582a0f5729801e1e6fb8f5f3242a0b760
Reviewed-by: Caroline Chao <caroline.chao@digia.com>
Reviewed-by: Martin Smith <martin.smith@digia.com>