docs/sp_SP: Add memory-barriers.txt Spanish translation

Translate the following documents into Spanish:

- memory-barriers.txt

using the wrapper documents system.

Signed-off-by: Carlos Bilbao <carlos.bilbao@amd.com>
Link: https://lore.kernel.org/r/20221128152323.4080455-1-carlos.bilbao@amd.com


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