added optimization-hint

git-svn-id: http://svn.linuxfromscratch.org/LFS/trunk/BOOK@427 4aa44e1e-78dd-0310-a6d2-fbcd4c07a689

chapter06/aboutdebug.xml

@@ -59,5 +59,11 @@ Most people will probably never use a debugger on software, so by
 removing those symbols a lot of diskspace can be regained.
 </para>
 
+<para>
+You might find additional information in the optimization hint which can 
+be found at <ulink url="http://cvs.linuxfromscratch.org/index.cgi/hints/">
+http://cvs.linuxfromscratch.org/index.cgi/hints/</ulink>.
+</para>
+
 </sect1>