Replace dead trolltech website with trinity ones.

Signed-off-by: Chris <xchrisx@uber.space>
Signed-off-by: Michele Calgaro <michele.calgaro@yahoo.it>
(cherry picked from commit d368cdf93e)

src/dialogs/qmessagebox.cpp

@@ -603,7 +603,7 @@ void QMessageBox::init( int button0, int button1, int button2 )
 	    "Linux, and all major commercial Unix variants."
 	    "<br>Qt is also available for embedded devices.</p>"
 	    "<p>Qt is a Trolltech product. "
-	    "See <tt>http://www.trolltech.com/qt/</tt> "
+	    "See <tt>https://trinitydesktop.org/docs/qt3/</tt> "
 	    "for more information.</p>"
 	    ).arg( QT_VERSION_STR );
 #endif