No more raising of string exceptions!

The next step of PEP 352 (for 2.6) causes raising a string exception to trigger
a TypeError.  Trying to catch a string exception raises a DeprecationWarning.
References to string exceptions has been removed from the docs since they are
now just an error.
diff --git a/Misc/NEWS b/Misc/NEWS
index 7dc2bc3..fd760aa 100644
--- a/Misc/NEWS
+++ b/Misc/NEWS
@@ -12,6 +12,9 @@
 Core and builtins
 -----------------
 
+- PEP 352: Raising a string exception now triggers a TypeError.  Attempting to
+  catch a string exception raises DeprecationWarning.
+
 - Bug #1377858: Fix the segfaulting of the interpreter when an object created
   a weakref on itself during a __del__ call for new-style classes (classic
   classes still have the bug).