add __FreeBSD_version values from CURRENT to porters-handbook

[lifanov_mail.lifanov.com]

Summary

Several versions were added after 1100116, including 1100117, which
I already had to use in a PR: https://bugs.freebsd.org/bugzilla/show_bug.cgi?id=211227
Take this opportunity to add the rest of the versions from CURRENT.

[lifanov_mail.lifanov.com]

Add missing __FreeBSD_version values for stable/11 as well.

[lifanov_mail.lifanov.com]

It's supposed to be stable/10. Add a missing version and fix numbers.

[wblock]

Markup looks fine, can't speak for the revision numbers, though.

[lifanov_mail.lifanov.com]

Hi Warren! I think I got revision numbers correct. I was hoping you would review the language I used. Most was taken from commit messages, but I'm sure it could be improved.

[wblock]

en_US.ISO8859-1/books/porters-handbook/versions/chapter.xml

5429 ↗

(On Diff #18671)

"is" is the wrong tense. Maybe "after libcrypto.so was made position independent"?

[lifanov_mail.lifanov.com]

Address wblock's comments

[lifanov_mail.lifanov.com]

attempt to fix RSS feeds

See https://bugs.freebsd.org/bugzilla/show_bug.cgi?id=206683 for explanation.
I chose to use https:// here, but http:// will also work.

[lifanov_mail.lifanov.com]

Nooo!!!! I updated the wrong revision! Let me see if I can restore the old patch...

[lifanov_mail.lifanov.com]

restore good patch

[lifanov_mail.lifanov.com]

Hi Warren! If this is ready, can you commit it please? I have Bugzilla #211296 about this.