docs: update file link location

Fix web error: this site can't be reached

Signed-off-by: Tommaso Merciai <tomm.merciai@gmail.com>
Link: https://lore.kernel.org/r/20211003220706.7784-1-tomm.merciai@gmail.com
Signed-off-by: Jonathan Corbet <corbet@lwn.net>
1 file changed