Atexit (#32)

* add atexit use case

* changed title, how to teach this (#31)

Author: iritkatriel

except_star.md

@@ -1,6 +1,5 @@
 
-# except*
-
+# Exception Groups and except*
 
 ## Abstract
 
@@ -860,6 +859,11 @@ to be updated.
 
 ## How to Teach This
 
+`ExceptionGroup`s and `except*` will be documented as part of the language
+standard. Libraries that raise `ExceptionGroup`s such as `asyncio` will need to
+specify this in their documentation and clarify which API calls need to be
+wrapped with `try-except*` rather than `try-except`.
+
 ## Reference Implementation
 
 We developed these concepts (and the examples for this PEP) with