Update v12 release notes through today, and add major-enhancements list.
I still want to review the rest of the notes, but this seems like the
minimum work required to prepare for beta4.
Major-enhancements text, and a couple of other fixes, from Jonathan Katz
(with minor copy-editing by me).
Branch
------
REL_12_STABLE
Details
-------
https://git.postgresql.org/pg/commitdiff/700a1ac073730eca8b2d2235ced133f563a26a1b
Modified Files
--------------
doc/src/sgml/release-12.sgml | 234 +++++++++++++++++++++++++++++++++++++++----
1 file changed, 216 insertions(+), 18 deletions(-)
