Document that COPY OUT requires an absolute pathname.

As suggested by Etsuro Fujita, but with somewhat different wording.

Branch
------
master

Details
-------
http://git.postgresql.org/pg/commitdiff/b9ea8d20fde981997425ba72de7aa23e319e753e

Modified Files
--------------
doc/src/sgml/ref/copy.sgml |    7 ++++---
1 files changed, 4 insertions(+), 3 deletions(-)

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