Document that pg_upgrade requires PGHOST be set for any pre-9.1 servers
with a socket directory mismatch with the new server.

Backpatch to 9.2.

Branch
------
master

Details
-------
http://git.postgresql.org/pg/commitdiff/00a8eb61a254f620dbf4ba5de2f33831f159cdeb

Modified Files
--------------
doc/src/sgml/pgupgrade.sgml |    9 ++++-----
1 files changed, 4 insertions(+), 5 deletions(-)

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