doc PG 19 relnotes: add more markup, move some items to sysviews

Bruce Momjian <bruce@momjian.us>

Commit: b45137f315bb49fa4f50ae9cc16fda0a49196610
Author: Bruce Momjian <bruce@momjian.us>
Date: 2026-06-05T15:38:54Z
doc PG 19 relnotes: add more markup, move some items to sysviews

Also remove duplicate psql tab completion authors.

Reported-by: duplicates reported by Yugo Nagata

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doc/src/sgml/release-19.sgml modified +177 −188