docs/sp_SP: Add kernel-docs.rst Spanish translation

Translate Documentation/process/kernel-docs.rst into Spanish.

Signed-off-by: Carlos Bilbao <carlos.bilbao@amd.com>
Link: https://lore.kernel.org/r/20221124170242.1892751-6-carlos.bilbao@amd.com


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