pgsql: pg_upgrade docs: clarify instructions on standby extensions

pg_upgrade docs: clarify instructions on standby extensions

Previously the pg_upgrade standby upgrade instructions said not to
execute pgcrypto.sql, but it should have referenced the extension
command "CREATE EXTENSION pgcrypto". This patch makes that doc change.

Reported-by: a private bug report

Backpatch-through: 9.4, where standby instructions were added

Branch
------
REL9_4_STABLE

Details
-------
http://git.postgresql.org/pg/commitdiff/ddcfeba95e2cdb90b1f37ac5cae97124373fa076

Modified Files
--------------
doc/src/sgml/pgupgrade.sgml | 3 ++-
1 file changed, 2 insertions(+), 1 deletion(-)

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