mention the --server synonym earlier

discussed on jabber

doc/guide/keactrl.xml

@@ -41,10 +41,11 @@ keactrl <command> [-c keactrl-config-file] [-s server[,server,..]]
 
       <para>
         The optional <command>-s server[,server ...]</command> switch selects
-        the servers to which the command is issued. If absent,
-        the command is sent to all servers enabled in the keactrl
-        configuration file (<command>--server</command> is a synonym for
-        <command>-s</command>). If multiple servers are specified, they
+        the servers to which the command is issued.
+        (<command>--server</command> is a synonym for <command>-s</command>.)
+        If absent, the command is sent to all servers enabled in the keactrl
+        configuration file.
+        If multiple servers are specified, they
         should be separated by commas with no intervening spaces.
       </para>
     </section>