Remove useless \withsubitem.
diff --git a/Doc/ref/ref3.tex b/Doc/ref/ref3.tex
index cced29e..2b556e4 100644
--- a/Doc/ref/ref3.tex
+++ b/Doc/ref/ref3.tex
@@ -1724,7 +1724,6 @@
   \ttindex{__imul__()}
   \ttindex{__contains__()}
   \ttindex{__iter__()}}
-\withsubitem{(numeric object method)}
 
 \begin{methoddesc}[container object]{__len__}{self}
 Called to implement the built-in function