message: Link to tf.test.is_built_with_cuda
diff: @@ -1332,7 +1332,8 @@ def is_gpu_available(cuda_only=False, min_cuda_compute_capability=None):
  """Returns whether TensorFlow can access a GPU.
  Warning: if not GPU version of the package is installed, the function would
  - also, return False.
  + also, return False. Use `tf.test.is_built_with_cuda` to validate if TensorFlow
  + was build with CUDA support.
  Args:
  cuda_only: limit the search to CUDA GPUs.
  