Documentation: kasan: Use internal link to kunit

Use internal linking to KUnit documentation.

Signed-off-by: Bagas Sanjaya <[email protected]>

Author: bagasme

Documentation/dev-tools/kasan.rst

@@ -562,7 +562,5 @@ There are a few ways to run the KASAN tests.
    With ``CONFIG_KUNIT`` and ``CONFIG_KASAN_KUNIT_TEST`` built-in, it is also
    possible to use ``kunit_tool`` to see the results of KUnit tests in a more
    readable way. This will not print the KASAN reports of the tests that passed.
-   See `KUnit documentation <https://www.kernel.org/doc/html/latest/dev-tools/kunit/index.html>`_
-   for more up-to-date information on ``kunit_tool``.
-
-.. _KUnit: https://www.kernel.org/doc/html/latest/dev-tools/kunit/index.html
+   See :doc:`KUnit documentation <kunit/index>` for more up-to-date information
+   on ``kunit_tool``.