changed ref's like &chapter1; to &chapter01;

git-svn-id: http://svn.linuxfromscratch.org/LFS/trunk/BOOK@1557 4aa44e1e-78dd-0310-a6d2-fbcd4c07a689

book/part1.xml

@@ -1,7 +1,7 @@
 <part id="part1">
 <title>Part I - Introduction</title>
 
-&chapter1;
-&chapter2;
+&chapter01;
+&chapter02;
 
 </part>

book/part2.xml

@@ -1,12 +1,12 @@
 <part id="part2">
 <title>Part II - Installing the LFS system</title>
 
-&chapter3;
-&chapter4;
-&chapter5;
-&chapter6;
-&chapter7;
-&chapter8;
-&chapter9;
+&chapter03;
+&chapter04;
+&chapter05;
+&chapter06;
+&chapter07;
+&chapter08;
+&chapter09;
 
 </part>