Doc: Removing url variable from qdocconf file.

-url inherited from the url variable set in qtbase/doc/global

Change-Id: I5761a583cc1242f31f1beece7da2236c47e3a9bd
Reviewed-by: Martin Smith <martin.smith@digia.com>

src/multimedia/doc/qtmultimedia.qdocconf

@@ -2,7 +2,6 @@ include($QT_INSTALL_DOCS/global/qt-module-defaults.qdocconf)
 
 project                 = QtMultimedia
 description             = Qt Multimedia Documentation
-url                     = http://qt-project.org/doc/qt-$QT_VER
 version                 = $QT_VERSION
 
 # The following parameters are for creating a qhp file, the qhelpgenerator

src/multimediawidgets/doc/qtmultimediawidgets.qdocconf

@@ -2,7 +2,6 @@ include($QT_INSTALL_DOCS/global/qt-module-defaults.qdocconf)
 
 project                 = QtMultimediaWidgets
 description             = Qt Multimedia Widgets Documentation
-url                     = http://qt-project.org/doc/qt-$QT_VER
 version                 = $QT_VERSION
 
 # The following parameters are for creating a qhp file, the qhelpgenerator