nn.SiLU() citation correction (#1713)

utils/activations.py

@@ -5,7 +5,7 @@ import torch.nn as nn
 import torch.nn.functional as F
 
 
-# SiLU https://arxiv.org/pdf/1905.02244.pdf ----------------------------------------------------------------------------
+# SiLU https://arxiv.org/pdf/1606.08415.pdf ----------------------------------------------------------------------------
 class SiLU(nn.Module):  # export-friendly version of nn.SiLU()
     @staticmethod
     def forward(x):