minor fix in doc

doc/tutorial/shape_info.txt

@@ -53,9 +53,9 @@ can lead to errors. Consider this example:
 >>> theano.printing.debugprint(f) # doctest: +NORMALIZE_WHITESPACE
 MakeVector{dtype='int64'} [id A] ''   4
  |Elemwise{Add}[(0, 0)] [id B] ''   3
- | |Shape_i{0} [id C] ''   1
+ | |Shape_i{0} [id C] ''   2
  | | |x [id D]
- | |Shape_i{0} [id E] ''   2
+ | |Shape_i{0} [id E] ''   1
  |   |y [id F]
  |Shape_i{1} [id G] ''   0
    |x [id D]