doc: pg_upgrade, clarify standby servers must remain running

Also mention that mismatching primary/standby LSNs should never
happen.

Reported-by: Nikolay Samokhvalov

Discussion: 
https://postgr.es/m/cam527d8heqkjg5vrvju3xjsqxg41ufuyabd9qzccdaxnpbr...@mail.gmail.com

Backpatch-through: 11

Branch
------
master

Details
-------
https://git.postgresql.org/pg/commitdiff/b0d049e8fa0c7ad61f7aa0c95e2987b8bace7090

Modified Files
--------------
doc/src/sgml/ref/pgupgrade.sgml | 6 ++----
1 file changed, 2 insertions(+), 4 deletions(-)

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