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 <[e-mail]>
Reviewed-by: Dongliang Mu <[e-mail]>
Acked-by: Marco Elver <[e-mail]>
Signed-off-by: Jonathan Corbet <[e-mail]>
Link: https://lore.kernel.org/r/[e-mail]

Documentation/dev-tools/kcsan.rst

···
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 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`_.