doc: update PG 14 release notes

Bruce Momjian <bruce@momjian.us>

Commit: a3a681f8590d9476c8ce94172316d3d339375fe6
Author: Bruce Momjian <bruce@momjian.us>
Date: 2021-07-02T00:33:32Z
Releases: 14.0
doc:  update PG 14 release notes

Mostly addition of <literal> tags

Reported-by: Justin Pryzby

Discussion: https://postgr.es/m/20210629022547.GF21248@telsasoft.com

Backpatch-through: 14 only

Files

PathChange+/−
doc/src/sgml/release-14.sgml modified +17 −12

Documentation touched