pgsql: Update CREATE FUNCTION documentation about argument names.

Update CREATE FUNCTION documentation about argument names.

The 9.2 patch that added argument name support in SQL-language functions
missed updating a parenthetical comment about that in the CREATE FUNCTION
reference page. Noted by Erwin Brandstetter.

Branch
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master

Details
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http://git.postgresql.org/pg/commitdiff/c263f16a20a12ee63bbf0c4769d87db3184709eb

Modified Files
--------------
doc/src/sgml/ref/create_function.sgml | 5 +++--
1 files changed, 3 insertions(+), 2 deletions(-)

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