Doc: make an editing pass over the v12 release notes.

Tom Lane <tgl@sss.pgh.pa.us>

Commit: b6a4d0498757a6e345e07b2a84eb8333f5e5235e
Author: Tom Lane <tgl@sss.pgh.pa.us>
Date: 2019-09-07T15:21:42Z
Releases: 12.0
Doc: make an editing pass over the v12 release notes.

Copy-edit or rewrite some items, add some items that I thought
deserved documenting, remove some others that didn't (notably,
I'm not on board with documenting documentation changes), fix
some poorly-pointed links, move some items to other sections,
etc etc.

Files

PathChange+/−
doc/src/sgml/release-12.sgml modified +615 −562

Documentation touched