Instructions for creating the Postgres major release notes

With the idea that someone else will someday need to create the Postgres
major release notes, here are the instructions and editor macros I use,
and the intermediate files I created to generate the Postgres 16 major
release notes.

--
Bruce Momjian <bruce@momjian.us> https://momjian.us
EDB https://enterprisedb.com

Only you can decide what is important to you.