Documentation/sphinx: Fix typo in automarkup.py
"whan" -> "when"
Signed-off-by: Iris Shi <0.0@owo.li>
Signed-off-by: Jonathan Corbet <corbet@lwn.net>
Link: https://lore.kernel.org/r/8e5ddb7d-8faf-314f-b1b1-2d15d6900862@owo.li
authored by