Update docs for Prometheus: adopt the common warning message

Signed-off-by: Suguru Hirahara <acioustick@noreply.codeberg.org>

docs/configuring-playbook-prometheus-grafana.md

@@ -3,7 +3,7 @@
 The playbook can install [Prometheus](https://prometheus.io/) with [Grafana](https://grafana.com/) and configure performance metrics of your homeserver with graphs for you.
 
 > [!WARNING]
-> Metrics and resulting graphs can contain a lot of information. This includes system specs but also usage patterns. This applies especially to small personal/family scale homeservers. Someone might be able to figure out when you wake up and go to sleep by looking at the graphs over time. Think about this before enabling anonymous access. And you should really not forget to change your Grafana password.
+> Metrics and resulting graphs can contain a lot of information. This includes system specs but also usage patterns. This applies especially to small personal/family scale homeservers. Someone might be able to figure out when you wake up and go to sleep by looking at the graphs over time. Think about this before enabling (anonymous) access. And you should really not forget to change your Grafana password.
 >
 > Most of our docker containers run with limited system access, but the `prometheus-node-exporter` has access to the host network stack and (readonly) root filesystem. This is required to report on them. If you don't like that, you can set `prometheus_node_exporter_enabled: false` (which is actually the default). You will still get Synapse metrics with this container disabled. Both of the dashboards will always be enabled, so you can still look at historical data after disabling either source.
 

docs/configuring-playbook-prometheus-nginxlog.md

@@ -25,7 +25,7 @@ matrix_prometheus_nginxlog_exporter_enabled: true
 ### Save metrics on an external Prometheus server (optional)
 
 > [!WARNING]
-> Metrics and resulting graphs can contain a lot of information. nginx logs contain information like IP address, URLs, UserAgents and more. This information can reveal usage patterns and could be considered Personally Identifiable Information (PII). Think about this before enabling (anonymous) access. Please make sure you change the default Grafana password.
+> Metrics and resulting graphs can contain a lot of information. nginx logs contain information like IP address, URLs, UserAgents and more. This information can reveal usage patterns and could be considered Personally Identifiable Information (PII). Think about this before enabling (anonymous) access. And you should really not forget to change your Grafana password.
 
 The playbook will automatically integrate the metrics into the [Prometheus](./configuring-playbook-prometheus-grafana.md) server provided with this playbook (if enabled). In such cases, the metrics endpoint is not exposed publicly — it's only available on the container network.