Add an instruction on how to prevent keyboard reboots on a running system

in addition to the instruction listed for the kernel.

PR:		114925
Submitted by:	"David Yeske" <dyeske at gmail dot com>, slightly changed
		to make sure that the original text was still OK.

en_US.ISO8859-1/books/faq/book.sgml

@@ -6297,7 +6297,7 @@ options    SYSVMSG          # enable for messaging</programlisting>
         <answer>
           <para>If you are using syscons (the default console driver)
             build and install a new kernel with the
-            line</para>
+            line:</para>
 
           <programlisting>options SC_DISABLE_REBOOT</programlisting>
 
@@ -6305,6 +6305,11 @@ options    SYSVMSG          # enable for messaging</programlisting>
             driver, use the following kernel configuration line
             instead.</para>
 
+	  <para>This can also be done by setting the following sysctl
+	    which does not require a reboot or kernel recompile:</para>
+
+	  <screen>&prompt.root; <userinput>sysctl hw.syscons.kbd_reboot=0</userinput></screen>
+
           <programlisting>options PCVT_CTRL_ALT_DEL</programlisting>
         </answer>
       </qandaentry>