FreeBSD/doc 26754d9 (r53413)en_US.ISO8859-1/htdocs/releases/12.1R Makefile Makefile.hardware

- Connect the errata, hardware, and readme pages for 12.1 to the
  build.
- Comment the checksum file names.
- Bump _REVMINOR and _BRANCH.
- Rework the _BRANCH evaluation used to determine from where to
  check out the share/man/man4 directory for manual pages to
  use releng/X.Y for BETA, in addition to RC and RELEASE builds.

Sponsored by:   Rubicon Communications, LLC (Netgate)
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