Update service names in example workflow JSON

Author: julianwood

parallel-agent-early-stopping/example-workflow.json

@@ -9,7 +9,7 @@
     "videoId": "",
     "level": "200",
     "framework": "AWS SAM",
-    "services": ["bedrock","stepfunctions", "eventbridge","lambda"],
+    "services": ["bedrock","sfn", "eventbridge","lambda"],
     "introBox": {
       "headline": "How it works",
       "text": [