Fixes #1653: Remove outdated description for DeviceType's is_network_device flag

netbox/templates/dcim/devicetype.html

@@ -120,7 +120,7 @@
                     </td>
                     <td>
                         <strong>Network Device</strong><br />
-                        <small class="text-muted">This device {% if devicetype.is_network_device %}has{% else %}does not have{% endif %} non-management network interfaces</small>
+                        <small class="text-muted">This device {% if devicetype.is_network_device %}has{% else %}does not have{% endif %} network interfaces</small>
                     </td>
                 </tr>
                 <tr>