pgsql: pg_upgrade docs: clarify rsync and move verification step

pg_upgrade docs: clarify rsync and move verification step

These are adjustments based on someone using the new standby upgrade
steps.

Report by Andy Colson

Backpatch through 9.5

Branch
------
master

Details
-------
http://git.postgresql.org/pg/commitdiff/46bd95e2a873feb4799b77eca7276cf758e36cca

Modified Files
--------------
doc/src/sgml/ref/pgupgrade.sgml | 33 ++++++++++++++++++---------------
1 file changed, 18 insertions(+), 15 deletions(-)

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