First-draft release notes for next week's minor releases

[Tom Lane]

I've completed the first draft of the 14.3 release notes, see

https://git.postgresql.org/gitweb/?p=postgresql.git;a=commitdiff;h=66ca1427a4963012fd565b922d0a67a8a8930d1f

As usual, please send comments/corrections by Sunday.

                        regards, tom lane