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Add documentation for the env DI expresion function

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Original file line number	Diff line number	Diff line change
@@ -73,12 +73,14 @@ to another service: ``App\Mailer``. One way to do this is with an expression:
`73`	`73`
`74`	`74`	To learn more about the expression language syntax, see:doc:`/components/expression_language/syntax`.
`75`	`75`
`76`		`-In this context, you have access to2 functions:`
	`76`	`+In this context, you have access to3 functions:`
`77`	`77`
`78`	`78`	``service``
`79`	`79`	`Returns a given service (see the example above).`
`80`	`80`	``parameter``
`81`	`81`	Returns a specific parameter value (syntax is like ``service``).
	`82`	+``env``
	`83`	`+ Returns the value of an env variable.`
`82`	`84`
`83`	`85`	You also have access to the:class:`Symfony\\Component\\DependencyInjection\\Container`
`84`	`86`	via a ``container`` variable. Here's another example:

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