minor #21495 [Messenger] Clarify that RecoverableMessageHandlingException retryDelay is milliseconds (melkamar)

This PR was merged into the 7.3 branch.

Discussion
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[Messenger] Clarify that RecoverableMessageHandlingException retryDelay is milliseconds

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3b85970 Clarify that RecoverableMessageHandlingException retryDelay is milliseconds

Author: javiereguiluz

messenger.rst

@@ -1203,7 +1203,7 @@ and must be retried. If you throw
 :class:`Symfony\\Component\\Messenger\\Exception\\RecoverableMessageHandlingException`,
 the message will always be retried infinitely and ``max_retries`` setting will be ignored.
 
-You can define a custom retry delay (e.g., to use the value from the ``Retry-After``
+You can define a custom retry delay in milliseconds (e.g., to use the value from the ``Retry-After``
 header in an HTTP response) by setting the ``retryDelay`` argument in the
 constructor of the ``RecoverableMessageHandlingException``.