Make consistent with 2.4
diff --git a/Doc/lib/libsets.tex b/Doc/lib/libsets.tex
index 40ea031..dd85ec7 100644
--- a/Doc/lib/libsets.tex
+++ b/Doc/lib/libsets.tex
@@ -170,7 +170,7 @@
Also note, the module also includes a \method{union_update()} method
which is an alias for \method{update()}. The method is included for
backwards compatibility. Programmers should prefer the
-\method{update()} method because it is the one supported by the builtin
+\method{update()} method because it is supported by the builtin
\class{set()} and \class{frozenset()} types.
\subsection{Example \label{set-example}}