Update schema/workflow.yaml

Co-authored-by: Charles d'Avernas <charles.davernas@neuroglia.io>

Author: fjtirado

schema/workflow.yaml

@@ -1294,7 +1294,7 @@ $defs:
             description: An expression based event data schema.
       data:
         title: EventData
-        description: Allow filtering by data content
+        description: The event's payload data
         oneOf:
           - type: string
           - type: object