errata/article.xml:

• Prune stale entries from 11.1-RELEASE.
• Add an xml:id for diff reduction.

hardware/article.xml:

• Add an xml:id for diff reduction.

installation/article.xml:

• Add an xml:id for diff reduction.

readme/article.xml:

• Fix a malformed URL and mailing list reference.

readme/article.xml:

• Update the xml:id to match that used by readme/article.xml for consistency.

release.ent:

• Update versions, and switch from 'snapshot' to 'release'.

security.xml:

• Remove reference to 10.x.

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