Comment out cross-ref to page added in separate PR

Author: nastasha-solomon

explore-analyze/alerting/alerts.md

@@ -15,7 +15,10 @@ description: "Overview of Kibana alerting: rules, alerts, actions, connectors, a
 
 # Kibana alerting [alerts]
 
-Kibana alerting is the built-in alerting system in {{kib}}. It lets you define rules that check your data on a schedule, create alerts when conditions are met, and trigger actions through connectors (email, Slack, webhooks, and more). It is available on all deployments. For the experimental alerting features built on {{esql}}, refer to [Experimental alerting features](kibana-alerting-experimental.md).
+Kibana alerting is the built-in alerting system in {{kib}}. It lets you define rules that check your data on a schedule, create alerts when conditions are met, and trigger actions through connectors (email, Slack, webhooks, and more). It is available on all deployments.
+<!-- TODO: Uncomment when PR #6521 (experimental overview) is merged:
+For the experimental alerting features built on {{esql}}, refer to [Experimental alerting features](kibana-alerting-experimental.md).
+-->
 
 ## {{rules-ui}} [rules]