docs: improve pg_upgrade rsync instructions
authorBruce Momjian <bruce@momjian.us>
Tue, 12 Sep 2017 17:17:52 +0000 (13:17 -0400)
committerBruce Momjian <bruce@momjian.us>
Tue, 12 Sep 2017 17:17:52 +0000 (13:17 -0400)
commit2d4a614e1ec34a746aca43d6a02aa3344dcf5fd4
tree7ac1f1e4c54cfd2d8f8c0c4fa18e16134b76bd14
parent2eeaa74b5ba20bc75bbaf10837a1ae966094d6cc
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
doc/src/sgml/ref/pgupgrade.sgml