docs/sp_SP: Add process magic-number translation

Translate the following document into Spanish:

- process/magic-number.rst

Signed-off-by: Carlos Bilbao <carlos.bilbao@amd.com>
Link: https://lore.kernel.org/r/20230125181840.3007341-1-carlos.bilbao@amd.com


[jc: escaped '*' to eliminate sphinx warning ]
Signed-off-by: Jonathan Corbet <corbet@lwn.net>