Relocate an index entry so named anchors are not generated in a section head.

Closes SF bug #546579.

Doc/ref/ref2.tex

@@ -149,8 +149,9 @@ lines.  Implicitly continued lines can also occur within triple-quoted
 strings (see below); in that case they cannot carry comments.
 
 
-\subsection{Blank lines \index{blank line}\label{blank-lines}}
+\subsection{Blank lines \label{blank-lines}}
 
+\index{blank line}
 A logical line that contains only spaces, tabs, formfeeds and possibly
 a comment, is ignored (i.e., no NEWLINE token is generated).  During
 interactive input of statements, handling of a blank line may differ