message: Fix simple.smithy
diff: @@ -116,7 +116,7 @@ structure HealthcheckOutputResponse {
  @documentation("Stores a blob for a service id")
  operation StoreServiceBlob {
  input: StoreServiceBlobInput,
  - output: StoreServiceBlobOutput
  + output: StoreServiceBlobOutput,
  errors: [ValidationException]
  }
  