correct external links in security section

Apertis wiki section https://www.apertis.org/designs/security/ contains invalid external links. Related links were corrected based on the context of the current paragraph.

Rendered version of my fork is available here: https://tino.lippold-ext.pages.apertis.org/apertis-website/

Signed-off-by: Tino Lippold Tino.Lippold@de.bosch.com