message: Minor docs fix for is_gpu_available
diff: @@ -1337,8 +1337,8 @@ def run_cuda_only(func=None):
  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. Use `tf.test.is_built_with_cuda` to validate if TensorFlow
  + Warning: if a non-GPU version of the package is installed, the function would
  + also return False. Use `tf.test.is_built_with_cuda` to validate if TensorFlow
  was build with CUDA support.
  Args:
  