Make variable values <replaceable> in /etc/sysconfig/ifconfig.xxx example.

+ little rewording of some comments.

git-svn-id: http://svn.linuxfromscratch.org/LFS/trunk/BOOK@11556 4aa44e1e-78dd-0310-a6d2-fbcd4c07a689

chapter07/network.xml

@@ -49,17 +49,17 @@
 <!-- jhalfs relies on the values for IFACE, IP, etc. If you want to change
      them, please inform the jhalfs maintainer. -->
 <screen><userinput>cd /etc/sysconfig/
-cat &gt; ifconfig.eth0 &lt;&lt; "EOF"
-<literal>ONBOOT=yes
-IFACE=eth0
-SERVICE=ipv4-static
-IP=192.168.1.2
-GATEWAY=192.168.1.1
-PREFIX=24
-BROADCAST=192.168.1.255</literal>
+cat &gt; ifconfig.<replaceable>eth0</replaceable> &lt;&lt; "EOF"
+<literal>ONBOOT=<replaceable>yes</replaceable>
+IFACE=<replaceable>eth0</replaceable>
+SERVICE=<replaceable>ipv4-static</replaceable>
+IP=<replaceable>192.168.1.2</replaceable>
+GATEWAY=<replaceable>192.168.1.1</replaceable>
+PREFIX=<replaceable>24</replaceable>
+BROADCAST=<replaceable>192.168.1.255</replaceable></literal>
 EOF</userinput></screen>
 
-    <para>The values of these variables must be changed in every file to match
+    <para>The values in italics must be changed in every file to match
     the proper setup.</para>
 
     <para>If the <envar>ONBOOT</envar> variable is set to <quote>yes</quote> the
@@ -71,7 +71,7 @@ EOF</userinput></screen>
 
     <para>The <envar>IFACE</envar> variable defines the interface name,
     for example, eth0.  It is required for all network device configuration
-    files. </para>
+    files. The filename extension must match this value.</para>
 
     <para>The <envar>SERVICE</envar> variable defines the method used for
     obtaining the IP address. The LFS-Bootscripts package has a modular IP