Specifying the .rst extension doesn't cause any problems AFAICT, but
it's uncommon.
Signed-off-by: NJonathan Neuschäfer <j.neuschaefer@gmx.net>
Link: https://lore.kernel.org/r/20201108132415.1789142-1-j.neuschaefer@gmx.netSigned-off-by: NJonathan Corbet <corbet@lwn.net>