Update the hardware page to reflect CPU updates/additions
added in head@r273941.

Since the original commit requires changes to the doc/
repository after the release tag had already happened,
(re)define entities in share/xml/release.ent that reflect
doc@r45900 to prevent build breakage.

Requested by: gavin
Approved by: re (implicit, relnotes)
Sponsored by: The FreeBSD Foundation