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doc: mention trigger helper functions in CREATE TRIGGER docs

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`@@ -447,6 +447,12 @@ UPDATE OF <replaceable>column_name1</replaceable> [, <replaceable>column_name2</`
`447`	`447`	`value did not change.`
`448`	`448`	`</para>`
`449`	`449`
	`450`	`+ <para>`
	`451`	`+ There are a few built-in trigger functions that can be used to`
	`452`	`+ solve common problems without having to write your own trigger code;`
	`453`	`+ see <xref linkend="functions-trigger">.`
	`454`	`+ </para>`
	`455`	`+`
`450`	`456`	`<para>`
`451`	`457`	`In a <literal>BEFORE</> trigger, the <literal>WHEN</> condition is`
`452`	`458`	`evaluated just before the function is or would be executed, so using`

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