pgsql: pg_upgrade docs: mention modification of postgresql.conf in new

pg_upgrade docs: mention modification of postgresql.conf in new cluster

Mention it might be necessary to modify postgresql.conf in the new
cluster to match the old cluster.

Backpatch to 9.2.

Suggested by user.

Branch
------
master

Details
-------
http://git.postgresql.org/pg/commitdiff/a11e15c7b66c647269ecad73560be0e717ffc400

Modified Files
--------------
doc/src/sgml/pgupgrade.sgml | 4 +++-
1 files changed, 3 insertions(+), 1 deletions(-)

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