Update Port Real Time Graph error (librenms#15846)

* Update graph-realtime.php

Fix Typo

* Update realtime.inc.php

Author: electrocret

html/graph-realtime.php

@@ -19,7 +19,7 @@
     $title .= ' :: Port  ' . generate_port_link($port);
     $auth = true;
 } else {
-    echo 'Unauthenticad';
+    echo 'Unauthenticated';
     exit;
 }
 

includes/html/pages/device/port/realtime.inc.php

@@ -37,6 +37,6 @@
 <div align="center" style="margin: 30px;">
 <object data="graph-realtime.php?type=bits&id=<?php echo $port['port_id'] . '&interval=' . htmlspecialchars($vars['interval']); ?>" type="image/svg+xml" width="1000" height="400">
 <param name="src" value="graph.php?type=bits&id=<?php echo $port['port_id'] . '&interval=' . htmlspecialchars($vars['interval']); ?>" />
-Your browser does not support the type SVG! You need to either use Firefox or download the Adobe SVG plugin.
+<a href="https://developer.mozilla.org/en-US/docs/Web/HTTP/Headers/X-Frame-Options">Your webserver has header X-Frame-Options set to DENY. Please change to SAMEORIGIN for realtime graphs.</a>
 </object>
 </div>