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doc: mention trigger helper functions in CREATE TRIGGER docs

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`@@ -457,6 +457,12 @@ UPDATE OF <replaceable>column_name1</replaceable> [, <replaceable>column_name2</`
`457`	`457`	`value did not change.`
`458`	`458`	`</para>`
`459`	`459`
	`460`	`+ <para>`
	`461`	`+ There are a few built-in trigger functions that can be used to`
	`462`	`+ solve common problems without having to write your own trigger code;`
	`463`	`+ see <xref linkend="functions-trigger"/>.`
	`464`	`+ </para>`
	`465`	`+`
`460`	`466`	`<para>`
`461`	`467`	`In a <literal>BEFORE</literal> trigger, the <literal>WHEN</literal> condition is`
`462`	`468`	`evaluated just before the function is or would be executed, so using`

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