Style(9) tweak

Warner Losh <[email protected]>
Newsgroups gmane.os.freebsd.architechture
Message-ID <CANCZdfq38GqANX_k3gUYo1himwavP70BX3DqhQcS6_3DgUchUQ@mail.gmail.com> 
Greetings,

Please review https://reviews.freebsd.org/D34152.

I've strengthened the admonition against $FreeBSD$. After this change,
style(9) recommends that you only include $FreeBSD$ in new code you are
sure will be merged to stable/12. If you later decide you need to merge
code to stable/12, you can always add $FreeBSD$ just before the merge.
Also, since stable/11 is no longer supported, I've removed references to it
as well.

Thanks!

Warner
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