fix duplicate label

add index turds

Doc/doc/doc.tex

@@ -3,6 +3,8 @@
 
 \title{Documenting Python}
 
+\makeindex
+
 \input{boilerplate}
 
 % Now override the stuff that includes author information;
@@ -409,7 +411,7 @@ This \UNIX\ is also followed by a space.
 \end{tableii}
 
 
-  \subsection{Hierarchical Structure \label{latex-syntax}}
+  \subsection{Hierarchical Structure \label{latex-structure}}
 
     \LaTeX{} expects documents to be arranged in a conventional,
     hierarchical way, with chapters, sections, sub-sections,
@@ -1847,4 +1849,6 @@ This \UNIX\ is also followed by a space.
     this document.  You can also send comments on this document
     directly to the author at \email{fdrake@acm.org}.
 
+\input{doc.ind}
+
 \end{document}