[install-guide/f21-branch] Use download.fp.o, not dl.fp.o

[pbokoc]

commit 808df3884c4d0dee9c9b3bdb65be3df412a3f3fd
Author: Petr Bokoc <pbokoc at redhat.com>
Date:   Wed Dec 10 20:05:46 2014 +0100

    Use download.fp.o, not dl.fp.o

 en-US/Network_based_Installations.xml |    2 +-
 1 files changed, 1 insertions(+), 1 deletions(-)
---
diff --git a/en-US/Network_based_Installations.xml b/en-US/Network_based_Installations.xml
index 4c2dd79..c342367 100644
--- a/en-US/Network_based_Installations.xml
+++ b/en-US/Network_based_Installations.xml
@@ -230,7 +230,7 @@ label server
 label rescue
   menu label ^Rescue installed system
   kernel f&PRODVER;/vmlinuz
-  append initrd=f&PRODVER;initrd.img ip=dhcp root=live:http://dl.fedoraproject.org/pub/fedora/linux/releases/&PRODVER;/Server/x86_64/os/LiveOS/squashfs.img rescue
+  append initrd=f&PRODVER;initrd.img ip=dhcp root=live:http://download.fedoraproject.org/pub/fedora/linux/releases/&PRODVER;/Server/x86_64/os/LiveOS/squashfs.img rescue
   
 label local
   menu label Boot from ^local drive