Correct minor mistakes in embeddings.py

combo/models/embeddings.py

-from typing import Optional
+from typing import Optional, List
 
 import torch
 from overrides import overrides
@@ -151,7 +151,7 @@ class _TorchEmbedder(TokenEmbedder):
         embedded = self._embedding(x)
         if self._projection:
             projection = self._projection
-            for _ in range(embedded.dim()-2):
+            for p in range(embedded.dim()-2):
                 projection = TimeDistributed(p)
             embedded = projection(embedded)
         return embedded