Fix the tutorial to make it work with python 32 and 64 bit.

doc/tutorial/examples.txt

@@ -254,8 +254,9 @@ for the purpose of one particular function.
 .. theano/tests/test_tutorial.py:T_examples.test_examples_8
 
 >>> fn_of_state = state * 2 + inc
->>> foo = T.iscalar()  # the type (lscalar) must match the shared variable we
->>>                    # are replacing with the ``givens`` list
+>>> # The type of foo must match the shared variable we are replacing
+>>> # with the ``givens``
+>>> foo = T.scalar(dtype=state.dtype)
 >>> skip_shared = function([inc, foo], fn_of_state,
                            givens=[(state, foo)])
 >>> skip_shared(1, 3)  # we're using 3 for the state, not state.value

theano/tests/test_tutorial.py

@@ -604,8 +604,9 @@ class T_examples(unittest.TestCase):
         assert state.get_value()       == array(0)
 
         fn_of_state = state * 2 + inc
-        foo = T.lscalar()    # the type (lscalar) must match the shared variable we
-                            # are replacing with the ``givens`` list
+        # The type of foo must match the shared variable we are replacing
+        # with the ``givens``
+        foo = T.scalar(dtype=state.dtype)
         skip_shared = function([inc, foo], fn_of_state,
                                givens=[(state, foo)])
         assert skip_shared(1, 3)       == array(7)