update docstring to reflect that argsort is imported (and sort is shadowed)

theano/tensor/basic.py

@@ -1797,7 +1797,7 @@ class _tensor_py_operators:
         return argmax(self, axis, keepdims=keepdims)
 
     def argsort(self,  axis=-1, kind='quicksort', order=None):
-        """See `theano.tensor.sort.argsort`"""
+        """See `theano.tensor.argsort`"""
         from theano.tensor.sort import argsort
         return argsort(self, axis, kind, order)