[COMMITTERS] pgsql: docs: improve pg_upgrade rsync instructions

docs:  improve pg_upgrade rsync instructions

This explains how rsync accomplishes updating standby servers and
clarifies the instructions.

Reported-by: Andreas Joseph Krogh

Discussion: https://postgr.es/m/VisenaEmail.10.2b4049e43870bd16.15d898d696f@tc7-visena

Backpatch-through: 9.5

Branch
------
REL9_6_STABLE

Details
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https://git.postgresql.org/pg/commitdiff/8d787bd66c8f64db85e0102f1dc1a0978d060fa1

Modified Files
--------------
doc/src/sgml/ref/pgupgrade.sgml | 42 ++++++++++++++++++++++++-----------------
1 file changed, 25 insertions(+), 17 deletions(-)


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