docs: update dev-tools/kcsan.rst url about KTSAN

The KTSAN doc has moved to
https://github.com/google/kernel-sanitizers/blob/master/KTSAN.md.
Update the url in kcsan.rst accordingly.
Signed-off-by: Haoyang Liu <tttturtleruss@hust.edu.cn>
Reviewed-by: Dongliang Mu <dzm91@hust.edu.cn>
Acked-by: Marco Elver <elver@google.com>
Signed-off-by: Jonathan Corbet <corbet@lwn.net>
Link: https://lore.kernel.org/r/20240725174632.23803-1-tttturtleruss@hust.edu.cn

Documentation/dev-tools/kcsan.rst

@@ -361,7 +361,8 @@ Alternatives Considered
 -----------------------
 
 An alternative data race detection approach for the kernel can be found in the
-`Kernel Thread Sanitizer (KTSAN) <https://github.com/google/ktsan/wiki>`_.
+`Kernel Thread Sanitizer (KTSAN)
+<https://github.com/google/kernel-sanitizers/blob/master/KTSAN.md>`_.
 KTSAN is a happens-before data race detector, which explicitly establishes the
 happens-before order between memory operations, which can then be used to
 determine data races as defined in `Data Races`_.