message: Update resnet doc
  added lost caution
  fixed reference according to
diff: @@ -538,14 +538,17 @@ decode_predictions.__doc__ = imagenet_utils.decode_predictions.__doc__
  DOC = """
  - Reference paper:
  - - [Deep Residual Learning for Image Recognition]
  - (https://arxiv.org/abs/1512.03385) (CVPR 2015)
  + Reference:
  + - [Deep Residual Learning for Image Recognition](
  + https://arxiv.org/abs/1512.03385) (CVPR 2015)
  Optionally loads weights pre-trained on ImageNet.
  Note that the data format convention used by the model is
  the one specified in your Keras config at `~/.keras/keras.json`.
  + Caution: Be sure to properly pre-process your inputs to the application.
  + Please see `applications.resnet.preprocess_input` for an example.
  +
  Arguments:
  include_top: whether to include the fully-connected
  layer at the top of the network.
  