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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REL9_2_STABLE

Details
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http://git.postgresql.org/pg/commitdiff/4a3613f930a1c895c2fdf83fa83a0f31b0c77e3b

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

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