Fix workflow samples

python/samples/03-workflows/orchestrations/concurrent_agents.py

@@ -28,7 +28,7 @@ Demonstrates:
 
 Prerequisites:
 - FOUNDRY_PROJECT_ENDPOINT must be your Azure AI Foundry Agent Service (V2) project endpoint.
-- Azure OpenAI configured for FoundryChatClient with required environment variables.
+- FOUNDRY_MODEL must be set to your Azure OpenAI model deployment name.
 - Authentication via azure-identity. Use AzureCliCredential and run az login before executing the sample.
 - Familiarity with Workflow events (WorkflowEvent)
 """
@@ -38,7 +38,7 @@ async def main() -> None:
     # 1) Create three domain agents using FoundryChatClient
     client = FoundryChatClient(
         project_endpoint=os.environ["FOUNDRY_PROJECT_ENDPOINT"],
-        model=os.environ["AZURE_AI_MODEL_DEPLOYMENT_NAME"],
+        model=os.environ["FOUNDRY_MODEL"],
         credential=AzureCliCredential(),
     )