Mention that pg_upgrade requires write permission in the currentdirectory.
Per report from Harald Armin Massa.
Branch------master
Details-------http://git.postgresql.org/gitweb?p=postgresql.git;a=commitdiff;h=ae9acb677950cf2afa037349b73fa3351d6e1d31
Modified Files--------------doc/src/sgml/pgupgrade.sgml | 3 ++-1 files changed, 2 insertions(+), 1 deletions(-)
