- Correct the FreeBSD release displayed on the 10.1-R errata

- Correct the FreeBSD release displayed on the 10.1-R errata
  page.
- Trim stale errata items from 10.0-RELEASE, but keep the
  entry regarding FreeBSD/i386 on VirtualBox, as I am unsure
  if the underlying cause was identified and/or corrected.
- Fix a few occurances of 'release.prev' macros that should
  be 'release.current'. [1]
- Switch release.ent entities to reflect a release, and update
  versions where appropriate.

Submitted by:	pluknet [1]
Approved by:	re (implicit)
Sponsored by:	The FreeBSD Foundation

git-svn-id: svn://svn.freebsd.org/base/releng/10.1@273082 ccf9f872-aa2e-dd11-9fc8-001c23d0bc1f