minor #13800 Typo fix : additonal ⮞ additional (Levure)

This PR was merged into the 4.4 branch.

Discussion
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Typo fix : additonal ⮞ additional

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0c790b5 Typo fix : additonal ⮞ additional

Author: javiereguiluz

workflow.rst

@@ -458,7 +458,7 @@ This means that each event has access to the following information:
     Returns a metadata.
 
 For Guard Events, there is an extended :class:`Symfony\\Component\\Workflow\\Event\\GuardEvent` class.
-This class has these additonal methods:
+This class has these additional methods:
 
 :method:`Symfony\\Component\\Workflow\\Event\\GuardEvent::isBlocked`
     Returns if transition is blocked.