Обсуждение: pgsql: Docs: clarify treatment of variadic functions with zero variadic

Docs: clarify treatment of variadic functions with zero variadic arguments.

Explain that you have to use "VARIADIC ARRAY[]" to pass an empty array
to a variadic parameter position.  This was already implicit in the text
but it seems better to spell it out.

Per a suggestion from David Johnston, though I didn't use his proposed
wording.  Back-patch to all supported branches.

Branch
------
REL9_2_STABLE

Details
-------
http://git.postgresql.org/pg/commitdiff/ee56e14bbb6f3593e79c1d7e22b02bbc6df4b500

Modified Files
--------------
doc/src/sgml/xfunc.sgml |   14 ++++++++++++++
1 file changed, 14 insertions(+)