13.2 relnotes: misc updates

Some additions and version number updates. Re-add mention of
restarting sshd (via reboot) with clarification of the actual problem;
this is just an example. Note that Alder Lake cache problem is likely
hardware.

Reviewed by: carlavilla (previous version), pauamma
Approved by: carlavilla
Differential Revision: https://reviews.freebsd.org/D38827