Fixed name following rename of file and section.

5c85bb5d · Frederic Bastien · 9aeb197e · 5c85bb5d
--- a/doc/tutorial/index.txt
+++ b/doc/tutorial/index.txt
@@ -35,7 +35,7 @@ you out.
    conditions
    loop
    using_gpu
-    pycuda
+    gpu_data_convert
    shape_info
    remarks
    debug_faq