Fix workflow samples

python/samples/03-workflows/human-in-the-loop/sequential_request_info.py

@@ -18,7 +18,7 @@ Demonstrate:
 
 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 (run az login before executing)
 """
 
@@ -96,7 +96,7 @@ async def process_event_stream(stream: AsyncIterable[WorkflowEvent]) -> dict[str
 async def main() -> None:
     client = FoundryChatClient(
         project_endpoint=os.environ["FOUNDRY_PROJECT_ENDPOINT"],
-        model=os.environ["AZURE_AI_MODEL_DEPLOYMENT_NAME"],
+        model=os.environ["FOUNDRY_MODEL"],
         credential=AzureCliCredential(),
     )