pgsql: doc: Improve claim about location of pg_service.conf

doc: Improve claim about location of pg_service.conf

The previous wording claimed that the file was always in /etc, but of
course this varies with the installation layout. Write instead that it
can be found via `pg_config --sysconfdir`. Even though this is still
somewhat incorrect because it doesn't account of moved installations, it
at least conveys that the location depends on the installation.

Branch
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REL9_0_STABLE

Details
-------
http://git.postgresql.org/pg/commitdiff/b09ca88346096a16faaeda0de0ee1ea167dbc6c1

Modified Files
--------------
doc/src/sgml/libpq.sgml | 2 +-
1 file changed, 1 insertion(+), 1 deletion(-)

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