custom xreflabel for toolchaintechnotes: 'section ii' is really stupid

git-svn-id: http://svn.linuxfromscratch.org/LFS/trunk/BOOK@11951 4aa44e1e-78dd-0310-a6d2-fbcd4c07a689

part3intro/toolchaintechnotes.xml

@@ -5,7 +5,7 @@
   %general-entities;
 ]>
 
-<sect1 id="ch-tools-toolchaintechnotes">
+<sect1 id="ch-tools-toolchaintechnotes" xreflabel="Toolchain Technical Notes">
   <?dbhtml filename="toolchaintechnotes.html"?>
 
   <title>Toolchain Technical Notes</title>