Doc and NEWS changes due to Jeremy adding traceback objects to gc.
diff --git a/Doc/lib/libsys.tex b/Doc/lib/libsys.tex
index 4059e02..895ba91 100644
--- a/Doc/lib/libsys.tex
+++ b/Doc/lib/libsys.tex
@@ -109,7 +109,10 @@
exception type and value. If you do need the traceback, make sure
to delete it after use (best done with a \keyword{try}
... \keyword{finally} statement) or to call \function{exc_info()} in
- a function that does not itself handle an exception.}
+ a function that does not itself handle an exception.} \note{Beginning
+ with Python 2.2, such cycles are automatically reclaimed when garbage
+ collection is enabled and they become unreachable, but it remains more
+ efficient to avoid creating cycles.}
\end{funcdesc}
\begin{datadesc}{exc_type}