In pg_upgade, document that the port numbers must be different when
checking an old running server.

Branch
------
master

Details
-------
http://git.postgresql.org/pg/commitdiff/f789909b59c59a33e34feac3bed2c86f18159122

Modified Files
--------------
doc/src/sgml/pgupgrade.sgml |    6 ++++--
1 files changed, 4 insertions(+), 2 deletions(-)

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