[models.pasa] Add comment on network output and loss compatibility

src/ptbench/models/pasa.py

@@ -23,6 +23,9 @@ class Pasa(pl.LightningModule):
 
     Simple CNN for classification based on paper by [PASA-2019]_.
 
+    This network has a linear output.  You should use losses with ``WithLogit``
+    instead of cross-entropy versions when training.
+
 
     Parameters
     ----------