Remove mention to deprecated config.ctc.enabled flag in CTC Op's docstring

theano/tensor/nnet/ctc.py

@@ -191,7 +191,7 @@ def ctc(activations, labels, input_lengths):
     Notes
     -----
     Using the loss function requires that Baidu's warp-ctc library is installed and the
-    configuration variables `config.ctc.enabled` and `config.ctc.root` be properly set.
+    configuration variable `config.ctc.root` be properly set.
 
     Parameters
     ----------