Updated explanation to talk about cp -a, not cp -R

git-svn-id: http://svn.linuxfromscratch.org/LFS/trunk/BOOK@740 4aa44e1e-78dd-0310-a6d2-fbcd4c07a689

chapter05/kernel-exp.xml

@@ -27,7 +27,7 @@ needing later on.
 </para>
 
 <para>
-<userinput>cp -R ../src/linux/include/linux .</userinput> and
+<userinput>cp -a ../src/linux/include/linux .</userinput> and
 <userinput>mkdir asm &amp;&amp; cp -a ../src/linux/include/asm/* .</userinput>:
 These commands copy the kernel headers in the 
 <filename>$LFS/usr/include</filename> directory.