Spelling fix: 'fo' => 'to' (#471)

Author: cbockman

tensor2tensor/layers/modalities.py

@@ -76,7 +76,7 @@ def _get_weights(self, hidden_dim=None):
     """Create or get concatenated embedding or softmax variable.
 
     Args:
-      hidden_dim: dim of the variable. Defaults fo self._body_input_depth
+      hidden_dim: dim of the variable. Defaults to self._body_input_depth
 
     Returns:
        a list of self._num_shards Tensors.