Minor clarification of the zip() description, based on a comment sent to

python-docs.

Doc/lib/libfuncs.tex

@@ -839,7 +839,7 @@ def my_import(name):
 \end{funcdesc}
 
 \begin{funcdesc}{zip}{seq1, \moreargs}
-  This function returns a list of tuples, where each tuple contains
+  This function returns a list of tuples, where the \var{i}-th tuple contains
   the \var{i}-th element from each of the argument sequences.  At
   least one sequence is required, otherwise a \exception{TypeError} is
   raised.  The returned list is truncated in length to the length of