example symlinks needed ln -sf (not just ln)

git-svn-id: http://svn.linuxfromscratch.org/LFS/trunk/BOOK@545 4aa44e1e-78dd-0310-a6d2-fbcd4c07a689

chapter06/config-glibc.xml

@@ -64,7 +64,7 @@ The symlink you'd create with that information would be:
 </para>
 
 <blockquote><literallayout>
-	<userinput>ln -s ../usr/share/zoneinfo/EST5EDT localtime</userinput> 
+	<userinput>ln -sf ../usr/share/zoneinfo/EST5EDT localtime</userinput> 
 </literallayout></blockquote>
 
 <para>
@@ -72,7 +72,7 @@ Or:
 </para>
 
 <blockquote><literallayout>
-	<userinput>ln -s ../usr/share/zoneinfo/Canada/Eastern localtime
+	<userinput>ln -sf ../usr/share/zoneinfo/Canada/Eastern localtime
 		</userinput>
 </literallayout></blockquote>