SF bug #757822: Additional index items, other minor details

* Minor grammatical fix.

Doc/lib/libpickle.tex

@@ -20,8 +20,8 @@ inverse operation, whereby a byte stream is converted back into an
 object hierarchy.  Pickling (and unpickling) is alternatively known as
 ``serialization'', ``marshalling,''\footnote{Don't confuse this with
 the \refmodule{marshal} module} or ``flattening'',
-however the preferred term used here is ``pickling'' and
-``unpickling'' to avoid confusing.
+however, to avoid confusion, the terms used here are ``pickling'' and
+``unpickling''.
 
 This documentation describes both the \module{pickle} module and the 
 \refmodule{cPickle} module.