typo fix

git-svn-id: http://svn.linuxfromscratch.org/LFS/trunk/BOOK@2305 4aa44e1e-78dd-0310-a6d2-fbcd4c07a689

appendixa/bash-desc.xml

@@ -2,7 +2,7 @@
 
 <para>Last checked against version &bash-contversion;.</para>
 
-<sect3><title>ProgramfFiles descriptions</title>
+<sect3><title>Program files descriptions</title>
 
 <sect4><title>bash</title>
 <para>bash is the Bourne-Again SHell, which is a widely used command