correct external links to apparmor wiki pages in designs - security section

Apertis wiki section https://www.apertis.org/designs/security/ contains invalid links to apparmor wiki pages. Related links were corrected based on the context of the current paragraph. But I cannot guarantee that correct links/pages were selected. Hence new links to apparmor wiki pages have to be verified.

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