Add multiprocessing.Process.sentinel to whatsnew, mention SSLFakeFile removal.

Doc/whatsnew/3.3.rst

@@ -1481,6 +1481,11 @@ multiprocessing connections.
 to override the default behavior of inheriting the ``daemon`` flag from
 the parent process (:issue:`6064`).
 
+New attribute attribute :data:`multiprocessing.Process.sentinel` allows a
+program to wait on multiple :class:`~multiprocessing.Process` objects at one
+time using the appropriate OS primitives (for example, :mod:`select` on
+posix systems).
+
 
 nntplib
 -------
@@ -2278,6 +2283,10 @@ Porting Python code
 
 * The deprecated variable ``time.accept2dyear`` has been removed.
 
+* The undocumented internal helper class ``SSLFakeFile`` has been
+  removed from :mod:`smtplib`, since its functionality has long been
+  provided directly by :meth:`socket.socket.makefile`.
+
 
 Porting C code
 --------------