[system-administrators-guide/22] Improve "using the serial console" example

[stephenw]

commit 486785ea6f5946f180ff5a8576e3a46bacc49f40
Author: Stephen Wadeley <swadeley(a)redhat.com&gt;
Date:   Fri Jul 17 10:38:07 2015 +0200

    Improve "using the serial console" example
    
    add a synopsis before the command
    add some examples of serial ports

 en-US/Working_with_the_GRUB_2_Boot_Loader.xml |   11 ++++++-----
 1 files changed, 6 insertions(+), 5 deletions(-)
---
diff --git a/en-US/Working_with_the_GRUB_2_Boot_Loader.xml
b/en-US/Working_with_the_GRUB_2_Boot_Loader.xml
index 607c438..b0b37b2 100644
--- a/en-US/Working_with_the_GRUB_2_Boot_Loader.xml
+++ b/en-US/Working_with_the_GRUB_2_Boot_Loader.xml
@@ -741,13 +741,14 @@ For more information on adding kernel options, see <xref
linkend="sec-Editing_an
 			</para>
 <screen>~]#&nbsp;<command>dnf install
screen</command></screen>
 			<para>
-				To connect to your machine using the serial console, run the following command:
+				To connect to your machine using the serial console, use a command in the follow
format:
 			</para>
-<screen>~]$&nbsp;<command>screen</command>
<filename>/dev/&lt;console_port&gt;</filename></screen>
+<synopsis>screen /dev/<replaceable>console_port</replaceable>
<replaceable>baud_rate</replaceable></synopsis>
 			<para>
-				By default, if no option is specified, <application>screen</application>
uses the standard 9600 baud rate. To set a different baud rate, run:
-			</para>
-<screen>~]$&nbsp;<command>screen</command>
<filename>/dev/&lt;console_port&gt;</filename>
<option>115200</option></screen>
+				By default, if no option is specified, <application>screen</application>
uses the standard 9600 baud rate. To set a higher baud rate, enter:
+<screen>~]$&nbsp;<command>screen</command>
<filename>/dev/<replaceable>console_port</replaceable></filename>
<option>115200</option></screen>
+Where <replaceable>console_port</replaceable> is
<literal>ttyS0</literal>, or <literal>ttyUSB0</literal>, and so
on.
+      </para>
 			<para>
 				To end the session in <application>screen</application>, press
<keycap>Ctrl</keycap>+<keycap>a</keycap>, type
<literal>:quit</literal> and press <keycap>Enter</keycap>.
 			</para>