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minor#10810 [Validator] Explained how to use array constant in annotation (nikophil)

This PR was squashed before being merged into the 3.4 branch (closes#10810).Discussion----------[Validator] Explained how to use array constant in annotationHi,few days ago i tried to add a new feature to the `choice` validator constraint, by adding a new `choicesFromConstant` option.symfony/symfony#29658But then, i realized this was already supported.I think this should be documented, as i think a lot of people don't know this feature.thanks.Commits-------7774aab [Validator] Explained how to use array constant in annotation

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reference/constraints
- Choice.rst

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`‎reference/constraints/Choice.rst‎`

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`@@ -47,13 +47,17 @@ If your valid choice list is simple, you can pass them in directly via the`
`47`	`47`
`48`	`48`	`class Author`
`49`	`49`	`{`
	`50`	`+ const GENRES = ['fiction', 'non-fiction'];`
	`51`	`+`
`50`	`52`	`/**`
`51`	`53`	`* @Assert\Choice({"New York", "Berlin", "Tokyo"})`
`52`	`54`	`*/`
`53`	`55`	`protected $city;`
`54`	`56`
`55`	`57`	`/**`
`56`		`- * @Assert\Choice(choices={"fiction", "non-fiction"}, message="Choose a valid genre.")`
	`58`	`+ * You can also directly provide an array constant to the "choices" option in the annotation`
	`59`	`+ *`
	`60`	`+ * @Assert\Choice(choices=Author::GENRES, message="Choose a valid genre.")`
`57`	`61`	`*/`
`58`	`62`	`protected $genre;`
`59`	`63`	`}`
`@@ -211,7 +215,7 @@ constraint.`
`211`	`215`	`}`
`212`	`216`	`}`
`213`	`217`
`214`		-If the callback isstored in a different class and is static, for example ``AppBundle\Entity\Genre``,
	`218`	+If the callback isdefined in a different class and is static, for example ``AppBundle\Entity\Genre``,
`215`	`219`	`you can pass the class name and the method as an array.`
`216`	`220`
`217`	`221`	`..configuration-block::`

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Commit687d345

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`‎reference/constraints/Choice.rst‎`

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