dhcrelay: change the description and help text to make it clear multiple...

dhcrelay: change the description and help text to make it clear multiple servers are supported (#1360)

* dhcrelay: change the description and help text to make it clear multiple servers are supported

* dhcrelay: minor spelling errors

(cherry picked from commit 60b48f01)

src/www/services_dhcp_relay.php

@@ -160,11 +160,11 @@ include("head.inc");
                       </td>
                     </tr>
                     <tr>
-                      <td><a id="help_for_server" href="#" class="showhelp"><i class="fa fa-info-circle"></i></a> <?=gettext("Destination server");?></td>
+                      <td><a id="help_for_server" href="#" class="showhelp"><i class="fa fa-info-circle"></i></a> <?=gettext("Destination servers");?></td>
                       <td>
                         <input name="server" type="text" value="<?=!empty($pconfig['server']) ? htmlspecialchars($pconfig['server']):"";?>" />
                         <div class="hidden" for="help_for_server">
-                          <?=gettext("This is the IP address of the server to which DHCP requests are relayed. You can enter multiple server IP addresses, separated by commas. Select \"Proxy requests to DHCP server on WAN subnet\" to relay DHCP packets to the server that was used on the WAN interface.");?>
+                          <?=gettext("These are the IP addresses of servers to which DHCP requests are relayed. You can enter multiple server IP addresses, separated by commas. Select \"Proxy requests to DHCP server on WAN subnet\" to relay DHCP packets to the server that was used on the WAN interface.");?>
                         </div>
                       </td>
                     </tr>