Fix Circle CI build_docs error

pytext/optimizer/radam.py

@@ -10,11 +10,11 @@
 
 class RAdam(Optimizer, PT_Optimizer):
     """Implements rectified adam as derived in the following paper:
-        "On the Variance of the Adaptive Learning Rate and Beyond"
-            (https://arxiv.org/abs/1908.03265)
+       "On the Variance of the Adaptive Learning Rate and Beyond"
+       (https://arxiv.org/abs/1908.03265)
 
-        This code is mostly a direct copy-paste of the code provided by the authors here:
-        https://github.com/LiyuanLucasLiu/RAdam/blob/master/radam.py
+       This code is mostly a direct copy-paste of the code provided by the authors here:
+       https://github.com/LiyuanLucasLiu/RAdam/blob/master/radam.py
     """
 
     class Config(Optimizer.Config):