mention cPickle and cStringIO

Doc/lib/libundoc.tex

@@ -10,6 +10,10 @@ posting by Fredrik Lundh; I have revised some modules' status.)
 
 ni.py -- New import scheme with package support
 
+cPickle.c -- mostly the same as pickle but no subclassing
+
+cStringIO.c -- mostly the same as StringIO but no subclassing
+
 
 \section{Frameworks; somewhat harder to document, but
 well worth the effort}

Doc/libundoc.tex

@@ -10,6 +10,10 @@ posting by Fredrik Lundh; I have revised some modules' status.)
 
 ni.py -- New import scheme with package support
 
+cPickle.c -- mostly the same as pickle but no subclassing
+
+cStringIO.c -- mostly the same as StringIO but no subclassing
+
 
 \section{Frameworks; somewhat harder to document, but
 well worth the effort}