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[Validator] Explained how to use array constant in annotation

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Original file line number	Diff line number	Diff line change
`@@ -46,13 +46,17 @@ If your valid choice list is simple, you can pass them in directly via the`
`46`	`46`
`47`	`47`	`class Author`
`48`	`48`	`{`
	`49`	`+ const GENRES = ['fiction', 'non-fiction'];`
	`50`	`+`
`49`	`51`	`/**`
`50`	`52`	`* @Assert\Choice({"New York", "Berlin", "Tokyo"})`
`51`	`53`	`*/`
`52`	`54`	`protected $city;`
`53`	`55`
`54`	`56`	`/**`
`55`		`- * @Assert\Choice(choices={"fiction", "non-fiction"}, message="Choose a valid genre.")`
	`57`	`+ * You can also directly provide an array constant to the "choices" option in the annotation`
	`58`	`+ *`
	`59`	`+ * @Assert\Choice(choices=Author::GENRES, message="Choose a valid genre.")`
`56`	`60`	`*/`
`57`	`61`	`protected $genre;`
`58`	`62`	`}`
`@@ -210,7 +214,7 @@ constraint.`
`210`	`214`	`}`
`211`	`215`	`}`
`212`	`216`
`213`		-If the callback isstored in a different class and is static, for example ``AppBundle\Entity\Genre``,
	`217`	+If the callback isdefined in a different class and is static, for example ``AppBundle\Entity\Genre``,
`214`	`218`	`you can pass the class name and the method as an array.`
`215`	`219`
`216`	`220`	`..configuration-block::`

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