docs: update operation id (#23)

Author: changsongd

optimization/snippets/get_operation.py

@@ -20,7 +20,7 @@ def get_operation(operation_full_id: str) -> None:
     """Get operation details and status."""
     # TODO(developer): Uncomment and set the following variables
     # operation_full_id = \
-    #     "projects/[projectId]/locations/operations/[operationId]"
+    #     "projects/[projectId]/operations/[operationId]"
 
     client = optimization_v1.FleetRoutingClient()
     # Get the latest state of a long-running operation.