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Slackware should not have to have those docs because grsecurity and selinux are not related to slackware. This is much like slackware not including documentation for how to use OpenOffice. All the documentation that you need is available on the selinux and grsecurity sites. If you can't figure out how to implement it, maybe you should get a better sysadmin.
We all know that gentoo has gone above and beyond on documentation, and I commend them on that.