Add some more information about mutt's ability to use the system

editor (by using the EDITOR variable in the environment) and
refer to mutt.org for more information.

PR:		docs/104706
Submitted by:	Dmitri Alenitchev<dmitri at wave dot net dot ru>
Facilitated by:	Snow B.V.

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

@@ -1984,7 +1984,11 @@ EOT</screen>
 	  &man.vi.1; command as an editor for creating and replying to
 	  emails.  This may be customized by the user by creating or
 	  editing their own <filename>.muttrc</filename> file in their home directory and setting the
-	  <literal>editor</literal> variable.</para>
+	  <literal>editor</literal> variable or by setting the
+	  <envar>EDITOR</envar> environment variable.  See
+	  <ulink url="http://www.mutt.org/"></ulink> for more
+	  information about configuring
+	  <application>mutt</application>.</para>
       </note>
 
       <para>In order to compose a new mail message, press
@@ -2007,6 +2011,7 @@ EOT</screen>
 	help, which can be accessed from most of the menus by pressing
 	the <keycap>?</keycap> key.  The top line also displays the
 	keyboard shortcuts where appropriate.</para>
+
     </sect2>
 
     <sect2 id="pine-command">