[install-guide] Fix formatting for NFS setup

[pbokoc]

commit 4d2327b61f969c8eac98586b4a660d50f99449fb
Author: Cristian Ciupitu <cristian.ciupitu at yahoo.com>
Date:   Mon Oct 14 17:18:23 2013 +0300

    Fix formatting for NFS setup

 en-US/pxe-server.xml |    4 ++--
 1 files changed, 2 insertions(+), 2 deletions(-)
---
diff --git a/en-US/pxe-server.xml b/en-US/pxe-server.xml
index 3623079..7b764ec 100644
--- a/en-US/pxe-server.xml
+++ b/en-US/pxe-server.xml
@@ -101,8 +101,8 @@
 	  to it:</para>
 	<screen><![CDATA[/mnt/dvd *(ro,async)]]></screen>
 	<para>Start the NFS server using the following commands:</para>
-	<screen><command><![CDATA[systemctl start rpcbind
-systemctl start nfs]]></command></screen>
+	<screen><command><![CDATA[systemctl start rpcbind]]></command>
+<command><![CDATA[systemctl start nfs]]></command></screen>
       </step>
       <step>
 	<para>To support HTTP installation, use <command>yum</command>