updated repository path in gpu/introduction (ticket #1260)

modules/gpu/doc/introduction.rst

@@ -74,5 +74,5 @@ While developing algorithms for multiple GPUs, note a data passing overhead. For
 With this algorithm, a dual GPU gave a 180
 %
 performance increase comparing to the single Fermi GPU. For a source code example, see
-https://code.ros.org/svn/opencv/trunk/opencv/samples/gpu/.
+http://code.opencv.org/svn/opencv/trunk/opencv/samples/gpu/.