Update yacc description for new bison.

git-svn-id: http://svn.linuxfromscratch.org/LFS/trunk/BOOK@2292 4aa44e1e-78dd-0310-a6d2-fbcd4c07a689

appendixa/bison-desc.xml

@@ -47,9 +47,9 @@ alone.</para></sect4>
 
 <sect4><title>yacc</title>
 
-<para>We create a bash script called yacc which calls bison using the -y
-option. This is for compatibility purposes for programs which use yacc
-instead of bison.</para></sect4>
+<para>This bash script calls bison using the -y option. This is for
+compatibility purposes for programs which use yacc instead of
+bison.</para></sect4>
 
 </sect3>