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minor#11127 Document Default env processor with null fallback (jderusse)

This PR was merged into the master branch.Discussion----------Document Default env processor with null fallbackDocument the fallback to `null`PR:symfony/symfony#30504Commits-------309bd58 Document Default env processor with null fallback

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Original file line number	Diff line number	Diff line change
`@@ -533,6 +533,8 @@ Symfony provides the following env var processors:`
`533`	`533`	`$container->setParameter('private_key', '%env(default:raw_key:file:PRIVATE_KEY)%');`
`534`	`534`	`$container->setParameter('raw_key', '%env(PRIVATE_KEY)%');`
`535`	`535`
	`536`	+ When the fallback parameter is ommited (ie. ``env(default::API_KEY)``), the value retrieved is ``null``.
	`537`	`+`
`536`	`538`	`..versionadded::4.3`
`537`	`539`
`538`	`540`	The ``default`` processor was introduced in Symfony 4.3.

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`‎configuration/external_parameters.rst‎`

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