Doc: Removing url variable from qdocconf file.

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

Change-Id: I4f64b5d342409fbe7013c8f5b6c1cef9b3c33673
Reviewed-by: Martin Smith <martin.smith@digia.com>

src/xmlpatterns/doc/qtxmlpatterns.qdocconf

@@ -2,7 +2,6 @@ include($QT_INSTALL_DOCS/global/qt-module-defaults.qdocconf)
 
 # Name of the project which must match the outputdir. Determines the .index file
 project = QtXmlPatterns
-url = http://qt-project.org/doc/qt-$QT_VER
 
 # Directories in which to search for files to document and images.
 # By default set to the root directory of the project for sources