pg_plan_advice: Document interaction with GEQO.

The general nature of this interaction has been understood (at least
by me) since before the original commit, but I failed to explicitly
document it. I also left behind an XXX in the README which I intended
to remove before commit. Fix those things.

Reported-by: Noah Misch <[email protected]>
Backpatch-through: 19
Discussion: 
https://postgr.es/m/ca+tgmoymxy-jip5qdhqneiyfebzqsaro6o2d9e8sznzqi1b...@mail.gmail.com

Branch
------
REL_19_STABLE

Details
-------
https://git.postgresql.org/pg/commitdiff/9ed2684b89a43a2dd6295fdb151a0a98608457d4

Modified Files
--------------
contrib/pg_plan_advice/README  |  2 --
doc/src/sgml/pgplanadvice.sgml | 16 ++++++++++++++++
2 files changed, 16 insertions(+), 2 deletions(-)

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