Обсуждение: [COMMITTERS] pgsql: docs: clarify pg_upgrade docs regarding standbys and rsync

docs:  clarify pg_upgrade docs regarding standbys and rsync

Document that rsync is an _optional_ way to upgrade standbys, suggest
rsync option --dry-run, and mention a way of upgrading one standby from
another using rsync.  Also clarify some instructions by specifying if
they operate on the old or new clusters.

Reported-by: Stephen Frost, Magnus Hagander

Discussion: https://postgr.es/m/20170914191250.GB6595@momjian.us

Backpatch-through: 9.5

Branch
------
REL9_5_STABLE

Details
-------
https://git.postgresql.org/pg/commitdiff/2efe122c5a479c03493995adadc8c80bec8015da

Modified Files
--------------
doc/src/sgml/ref/pgupgrade.sgml | 41 ++++++++++++++++++++++++-----------------
1 file changed, 24 insertions(+), 17 deletions(-)


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