minor #8087 [Workflow] Updated language for annouce event (Nyholm)

This PR was submitted for the 3.3 branch but it was merged into the 3.2 branch instead (closes #8087).

Discussion
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[Workflow] Updated language for annouce event

Related to symfony/symfony#23299

Commits
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9b6dce4 Updated language for annouce event

Author: xabbuh

workflow/usage.rst

@@ -230,7 +230,7 @@ order:
     * ``workflow.[workflow name].enter.[place name]``
 
 ``workflow.announce``
-    Triggered once for each workflow that now is available for the object.
+    Triggered once for each place that now is available for the object.
 
     The three events being dispatched are: