message: Update scaling docs
diff: @@ -17,7 +17,7 @@ into multiple different services, each running a different set of plugins. This
  is a more advanced approach and requires you to be able to route requests to
  the appropriate backends based on the plugin ID. Both for ingress, but also
  internal traffic between Backstage backends, which is done by creating a custom
  -implementation of the [PluginEndpointDiscover](../reference/backend-common.pluginendpointdiscovery.md) interface.
  +implementation of the [DiscoveryService](../reference/backend-plugin-api.discoveryservice.md) interface.
  Lastly, you can also replicate the Backstage deployments across multiple regions.
  This is not a pattern that there is built-in support for and typically only makes
  