Fix really bad typo, noted by Neil Schemenauer <nas@arctrix.com>.

Doc/lib/libcopy.tex

@@ -93,6 +93,6 @@ argument and the memo dictionary as second argument.
 \withsubitem{(copy protocol)}{\ttindex{__copy__()}\ttindex{__deepcopy__()}}
 
 \begin{seealso}
-\seemodule{pickle}{Discussion of the special mmethds used to
+\seemodule{pickle}{Discussion of the special methods used to
 support object state retrieval and restoration.}
 \end{seealso}