Various third to second person edits.

git-svn-id: http://svn.linuxfromscratch.org/LFS/trunk/BOOK@8910 4aa44e1e-78dd-0310-a6d2-fbcd4c07a689

prologue/prerequisites.xml

@@ -13,10 +13,10 @@
   <para>Building an LFS system is not a simple task. It requires a certain
   level of existing knowledge of Unix system administration in order to resolve
   problems, and correctly execute the commands listed. In particular, as an
-  absolute minimum, the reader should already have the ability to use the
+  absolute minimum, you should already have the ability to use the
   command line (shell) to copy or move files and directories, list directory
   and file contents, and change the current directory. It is also expected that
-  the reader has a reasonable knowledge of using and installing Linux
+  you have a reasonable knowledge of using and installing Linux
   software.</para>
 
   <para>Because the LFS book assumes <emphasis>at least</emphasis> this basic