Change the inception README to clarify the folder is mostly outdated (#2396)

inception/README.md

+**NOTE**: For the most part, you will find a newer version of this code at [models/slim](https://github.com/tensorflow/models/tree/master/slim). In particular:
+
+*   `inception_train.py` and `imagenet_train.py` should no longer be used. The slim editions for running on multiple GPUs are the current best examples.
+*   `inception_distributed_train.py` and `imagenet_distributed_train.py` are still valid examples of distributed training.
+
+For performance benchmarking, please see https://www.tensorflow.org/performance/benchmarks.
+
 # Inception in TensorFlow
 
 [ImageNet](http://www.image-net.org/) is a common academic data set in machine
@@ -22,11 +29,6 @@ model architecture.
 
 ## Description of Code
 
-**NOTE**: For the most part, you will find a newer version of this code at [models/slim](https://github.com/tensorflow/models/tree/master/slim). In particular:
-
-*   `inception_train.py` and `imagenet_train.py` should no longer be used. The slim editions for running on multiple GPUs are the current best examples.
-*   `inception_distributed_train.py` and `imagenet_distributed_train.py` are still valid examples of distributed training.
-
 The code base provides three core binaries for:
 
 *   Training an Inception v3 network from scratch across multiple GPUs and/or