Fix typos in examples

Author: Jake Simones

toolz/functoolz.py

@@ -839,7 +839,7 @@ def unfold(func, x):
     ...         return (x * 2, x + 1)
     ...
     >>> list(unfold(doubles, 1))
-    [2, 4, 6, 9, 10, 12, 14, 16, 18, 20]
+    [2, 4, 6, 8, 10, 12, 14, 16, 18, 20]
 
     If ``x`` has type ``A`` and the generator yields values of type ``B``,
     then ``func`` has type ``Callable[[A], Optional[Tuple[B, A]]]``.
@@ -865,7 +865,7 @@ def unfold_(predicate, func, succ, x):
     >>> double = lambda x: x * 2
     >>> inc = lambda x: x + 1
     >>> list(unfold(lte10, double, inc, 1))
-    [2, 4, 6, 9, 10, 12, 14, 16, 18, 20]
+    [2, 4, 6, 8, 10, 12, 14, 16, 18, 20]
 
     If ``x`` has type ``A`` and the generator yields values of type ``B``,
     then ``predicate`` has type ``Callable[[A], bool]``, ``func`` has type