LTS support and version clarifications

[grahamperrin]

… not inline with, and even clashes with, the FreeBSD website, …

… FreeBSD website information inline with the Handbook, …

… From the above Handbook quote: … contradiction with: …

… If you or Colin Percival feel that FreeBSD-STABLE should be designated otherwise, I strongly suggest: change all documentation accordingly. …

… FreeBSD Support Model. …

Re: clashes and contradictions in documentation and elsewhere, please see:

<https://forums.freebsd.org/posts/628989>