- Mark up .tiprc as filename [1]

- Mark up COM1 as devicename [2]
- Mark up ^^ with literal [3]

PR:		docs/123428 [1], docs/123430 [2], docs/123431 [3]
Submitted by:	pgj

en_US.ISO8859-1/books/handbook/serialcomms/chapter.sgml

@@ -771,7 +771,7 @@ sio3: type 16550A</screen>
 	  <para>Note that device numbers in &os; start from zero and not
 	    one (like they do, for instance in &ms-dos;-derived systems).
 	    This means that what &ms-dos;-based systems
-	    call <quote>COM1</quote> is
+	    call <devicename>COM1</devicename> is
 	    usually <filename>/dev/cuad0</filename> in &os;.</para>
 	</note>
 
@@ -2027,7 +2027,7 @@ big-university 5551114</programlisting>
 	fact, you can set it to the same as the force character, if you never
 	expect to use either of these features.</para>
 
-      <para>Here is a sample .tiprc file perfect for
+      <para>Here is a sample <filename>.tiprc</filename> file perfect for
 	<application>Emacs</application> users who need to type
 	<keycombo action="simul">
 	  <keycap>Ctrl</keycap><keycap>2</keycap>
@@ -2041,7 +2041,7 @@ big-university 5551114</programlisting>
       <programlisting>force=^^
 raisechar=^^</programlisting>
 
-      <para>The ^^ is
+      <para>The <literal>^^</literal> is
 	<keycombo action="simul">
 	  <keycap>Shift</keycap><keycap>Ctrl</keycap><keycap>6</keycap>
 	</keycombo>.</para>
@@ -2137,7 +2137,7 @@ raisechar=^^</programlisting>
       <procedure>
 
 	<step>
-	  <para>Connect the serial cable to COM1 and the controlling
+	  <para>Connect the serial cable to <devicename>COM1</devicename> and the controlling
 	    terminal.</para>
 	</step>