Issue 28644: Document recent changes in typing.py (Ivan L) (3.5->3.6)

diff --cc Doc/library/typing.rst
index a0666fed39acc1bd069f026084c0883bece3f5a5,dde705e680ca4c2930bfbe78e219a98bafb3ad60..16e7b83250bed2f96e16a29bce2fac9e70de0c54
--- 1/Doc/library/typing.rst
--- 2/Doc/library/typing.rst
+++ b/Doc/library/typing.rst
@@@ -10,8 -10,8 +10,8 @@@
  
  --------------
  
 -This module supports type hints as specified by :pep:`484`.  The most
 -fundamental support consists of the types :data:`Any`, :data:`Union`,
 +This module supports type hints as specified by :pep:`484` and :pep:`526`.
- The most fundamental support consists of the type :data:`Any`, :data:`Union`,
++The most fundamental support consists of the types :data:`Any`, :data:`Union`,
  :data:`Tuple`, :data:`Callable`, :class:`TypeVar`, and
  :class:`Generic`.  For full specification please see :pep:`484`.  For
  a simplified introduction to type hints see :pep:`483`.