message: Fix wrong api name in apis.md
  typed_output_tensor is the correct api name.
  It is implemented in the interpreter class.
diff: @@ -29,7 +29,7 @@ interpreter->AllocateTensors();
  float* input = interpreter->typed_input_tensor<float>(0);
  // Fill `input`.
  interpreter->Invoke();
  -float* output = interpreter->type_output_tensor<float>(0);
  +float* output = interpreter->typed_output_tensor<float>(0);
  ```
  ### Data Alignment
  