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Document the behavior of STRICT VARIADIC functions.

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Original file line number	Diff line number	Diff line change
`@@ -1,5 +1,5 @@`
`1`	`1`	`<!--`
`2`		`-$PostgreSQL: pgsql/doc/src/sgml/ref/create_function.sgml,v 1.88 2009/10/08 02:39:14 tgl Exp $`
	`2`	`+$PostgreSQL: pgsql/doc/src/sgml/ref/create_function.sgml,v 1.89 2010/02/14 00:48:12 tgl Exp $`
`3`	`3`	`-->`
`4`	`4`
`5`	`5`	`<refentry id="SQL-CREATEFUNCTION">`
`@@ -585,6 +585,13 @@ CREATE FUNCTION foo(int, int default 42) ...`
`585`	`585`	`existing calls of the function do not stop working when it is replaced.`
`586`	`586`	`</para>`
`587`	`587`
	`588`	`+ <para>`
	`589`	`+ If a function is declared <literal>STRICT</> with a <literal>VARIADIC</>`
	`590`	`+ argument, the strictness check tests that the variadic array <emphasis>as`
	`591`	`+ a whole</> is non-null. The function will still be called if the`
	`592`	`+ array has non-null elements.`
	`593`	`+ </para>`
	`594`	`+`
`588`	`595`	`</refsect1>`
`589`	`596`
`590`	`597`	`<refsect1 id="sql-createfunction-examples">`

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