docs: kmsan: fix formatting of "Example report"

Add a blank line to make the sentence before the list render as a
separate paragraph, not a definition.

Fixes: 93858ae7 ("kmsan: add ReST documentation")
Suggested-by: Bagas Sanjaya <bagasdotme@gmail.com>
Signed-off-by: Alexander Potapenko <glider@google.com>
Link: https://lore.kernel.org/r/20221107142255.4038811-1-glider@google.com


Signed-off-by: Jonathan Corbet <corbet@lwn.net>