PkgBase: documenting package-related issues

From: Graham Perrin <grahamperrin_at_gmail.com>
Date: Mon, 18 Sep 2023 18:33:10 UTC
<https://bugs.freebsd.org/bugzilla/show_bug.cgi?id=273859#c5>:

 > how can we document all these breakages and workarounds, so that 
people can just do the equivalent of `do-release-upgrade`?

I guess, for some types of issue there can be a package message.