Use localhost for node_exporter

doc/administration/monitoring/prometheus/node_exporter.md

@@ -20,10 +20,8 @@ To enable the node exporter:
 1. Save the file and [reconfigure GitLab][reconfigure] for the changes to
    take effect
 
-Prometheus it will now automatically begin collecting performance data from
-the node exporter. You can visit `<your_domain_name>:9100/metrics` for a real
-time representation of the metrics that are collected. Refresh the page and
-you will see the data change.
+Prometheus will now automatically begin collecting performance data from
+the node exporter exposed under `localhost:9100`.
 
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