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Add info about callback in options resolver

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Original file line number	Diff line number	Diff line change
`@@ -305,6 +305,26 @@ There is also an`
`305`	`305`	`method, which you can use if you want to add an allowed value to the previously`
`306`	`306`	`set allowed values.`
`307`	`307`
	`308`	`+If you need to add some more logic to the value validation process you can pass a callable`
	`309`	`+as an allowed value::`
	`310`	`+`
	`311`	`+ // ...`
	`312`	`+ protected function setDefaultOptions(OptionsResolverInterface $resolver)`
	`313`	`+ {`
	`314`	`+ // ...`
	`315`	`+`
	`316`	`+ $resolver->setAllowedValues(array(`
	`317`	`+ 'transport' => function($value) {`
	`318`	`+ return strpos($value, 'mail') !== false;`
	`319`	`+ }`
	`320`	`+ ));`
	`321`	`+ }`
	`322`	`+`
	`323`	`+Note that using this together with addAllowedValues will not work.`
	`324`	`+`
	`325`	`+..versionadded::2.5`
	`326`	`+ The callback support for allowed values was added in Symfony 2.5.`
	`327`	`+`
`308`	`328`	`Configure allowed Types`
`309`	`329`	`~~~~~~~~~~~~~~~~~~~~~~~`
`310`	`330`

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