update information on documentation

[[Imported from SVN: r6342]]

doc/buildsystem/buildsystem.tex

@@ -241,9 +241,9 @@ dune-foo/
 
 After running
 \begin{lstlisting}[language=make]
-./dune-common/bin/dunecontrol --module=foo --opts=config.opts all
+make doc
 \end{lstlisting}
-with a \texttt{config.opts} that enables documentation you should now find a
+in \texttt{dune-foo} you should now find a
 \texttt{html} \texttt{doxygen} documentation in
 \texttt{dune-foo/doc/doxygen/html/index.html}.\\