Remove an unnecessary "%" character that seems to cause a minor glitch
with the latest latex2html.
diff --git a/Doc/ref/ref3.tex b/Doc/ref/ref3.tex
index 7b0d0d6..8c2043f 100644
--- a/Doc/ref/ref3.tex
+++ b/Doc/ref/ref3.tex
@@ -1060,7 +1060,7 @@
 \end{methoddescni}
 
 
-\subsection{Additional methods for emulation of sequence types%
+\subsection{Additional methods for emulation of sequence types
   \label{sequence-methods}}
 
 The following methods can be defined to further emulate sequence