First-draft release notes for 16.4.
As usual, the release notes for other branches will be made by cutting
these down, but put them up for community review first.
Branch
------
REL_16_STABLE
Details
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https://git.postgresql.org/pg/commitdiff/ee219ee8c40d88e7a0ef52c3c1b76c90bbd0d164
Modified Files
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doc/src/sgml/release-16.sgml | 1239 ++++++++++++++++++++++++++++++++++++++++++
1 file changed, 1239 insertions(+)
