I've written $SUBJECT ... you can find them at
https://git.postgresql.org/gitweb/?p=postgresql.git;a=commitdiff;h=54dbd4dc78b045ffcc046b9a43681770c3992dd4
and in an hour or so they should be built in the devel docs at
https://www.postgresql.org/docs/devel/static/release-9-6-3.html
As usual, this one page contains entries for all back branches;
I'll split them up later.
Please review by Sunday.
regards, tom lane