Trim release documentation and errata. While here, put back
some conditional text in the errata that was removed during
5.0-RELEASE and never put back.
Note that the previous commit message for this file should have read:
"4.8-RELEASE is the latest release from the 4-STABLE branch." [1]
Pointed out by: Stijn Hoop <stijn@win.tue.nl> [1]
Approved by re (implicitly)
the size of the rendered release notes. By default, any element with
a role="historic" attribute won't get rendered in the output unless
the INCLUDE_HISTORIC Makefile variable is defined.
the release notes compare 5.0-CURRENT to 4.0-RELEASE, but in at least
one place it is beneficial to mention the last stable release of
FreeBSD (4.5-RELEASE).
Reviewed by: bmah