kcsan: fix a kernel-doc warning

One of the kernel-doc markups there have two "note" sections:

	./include/linux/kcsan-checks.h:346: warning: duplicate section name 'Note'

While this is not the case here, duplicated sections can cause
build issues on Sphinx. So, let's change the notes section
to use, instead, a list for those 2 notes at the same function.

Signed-off-by: Mauro Carvalho Chehab <mchehab+huawei@kernel.org>
Acked-by: Marco Elver <elver@google.com>
Link: https://lore.kernel.org/r/20f7995fab2ba85ce723203e9a7c822a55cca2af.1592895969.git.mchehab+huawei@kernel.org
Signed-off-by: Jonathan Corbet <corbet@lwn.net>

include/linux/kcsan-checks.h

@@ -337,11 +337,13 @@ static inline void __kcsan_disable_current(void) { }
  *		release_for_reuse(obj);
  *	}
  *
- * Note: ASSERT_EXCLUSIVE_ACCESS_SCOPED(), if applicable, performs more thorough
+ * Note:
- * checking if a clear scope where no concurrent accesses are expected exists.
  *
- * Note: For cases where the object is freed, `KASAN <kasan.html>`_ is a better
+ * 1. ASSERT_EXCLUSIVE_ACCESS_SCOPED(), if applicable, performs more thorough
- * fit to detect use-after-free bugs.
+ *    checking if a clear scope where no concurrent accesses are expected exists.
+ *
+ * 2. For cases where the object is freed, `KASAN <kasan.html>`_ is a better
+ *    fit to detect use-after-free bugs.
  *
  * @var: variable to assert on
  */