Add releng/10.1 to the security.xml support page.

Approved by:	re (implicit)
Sponsored by:	The FreeBSD Foundation


git-svn-id: svn+ssh://svn.freebsd.org/doc/head@45987 c2e8774f-c49f-e111-b436-862b2bbc8956
Add 10.0-RELEASE to the "Prior Releases Still Being Supported"
section.

Approved by:	re (implicit)
Sponsored by:	The FreeBSD Foundation


git-svn-id: svn+ssh://svn.freebsd.org/doc/head@45988 c2e8774f-c49f-e111-b436-862b2bbc8956