Remove the erroneous comment from resnet_v2.py again

Author: nealwu

slim/nets/resnet_v2.py

@@ -25,8 +25,6 @@
 
 The key difference of the full preactivation 'v2' variant compared to the
 'v1' variant in [1] is the use of batch normalization before every weight layer.
-Another difference is that 'v2' ResNets do not include an activation function in
-the main pathway. Also see [2; Fig. 4e].
 
 Typical use: