Alerting: updated docs regarding multi-org AM (#40982)

docs/sources/alerting/unified-alerting/message-templating/_index.md

@@ -22,7 +22,7 @@ You can create named templates and then reuse them in contact point fields or ot
 
 Grafana alerting UI allows you to configure templates for the Grafana managed alerts (handled by the embedded Alertmanager) as well as templates for an [external Alertmanager if one is configured]({{< relref "../../../datasources/alertmanager.md" >}}), using the Alertmanager dropdown.
 
-> **Note:** Currently the configuration of the embedded Alertmanager is shared across organisations. Therefore users are advised to use the new Grafana 8 Alerts only if they have one organisation otherwise templates for the Grafana managed alerts will be visible by all organizations
+> **Note:** Before Grafana v8.2, the configuration of the embedded Alertmanager was shared across organisations. Users of Grafana 8.0 and 8.1 are advised to use the new Grafana 8 Alerts only if they have one organisation. Otherwise, silences for the Grafana managed alerts will be visible by all organizations.
 
 ### Create a template
 

docs/sources/alerting/unified-alerting/notification-policies.md

@@ -11,7 +11,7 @@ Notification policies determine how alerts are routed to contact points. Policie
 
 Grafana alerting UI allows you to configure notification policies for the Grafana managed alerts (handled by the embedded Alertmanager) as well as notification policies for an [external Alertmanager if one is configured]({{< relref "../../datasources/alertmanager.md" >}}), using the Alertmanager dropdown.
 
-> **Note:** Currently the configuration of the embedded Alertmanager is shared across organisations. Therefore users are advised to use the new Grafana 8 Alerts only if they have one organisation otherwise notification policies for the Grafana managed alerts will be visible by all organizations.
+> **Note:** Before Grafana v8.2, the configuration of the embedded Alertmanager was shared across organisations. Users of Grafana 8.0 and 8.1 are advised to use the new Grafana 8 Alerts only if they have one organisation. Otherwise, silences for the Grafana managed alerts will be visible by all organizations.
 
 ## Edit notification policies
 

docs/sources/alerting/unified-alerting/silences.md

@@ -13,7 +13,7 @@ Silences do not prevent alert rules from being evaluated. They also do not stop
 
 Grafana alerting UI allows you to configure silences for the Grafana managed alerts (handled by the embedded Alertmanager) as well as silences for an [external Alertmanager if one is configured]({{< relref "../../datasources/alertmanager.md" >}}), using the Alertmanager dropdown.
 
-> **Note:** Currently the configuration of the embedded Alertmanager is shared across organisations. Therefore users are advised to use the new Grafana 8 Alerts only if they have one organisation otherwise silences for the Grafana managed alerts will be visible by all organizations.
+> **Note:** Before Grafana v8.2, the configuration of the embedded Alertmanager was shared across organisations. Users of Grafana 8.0 and 8.1 are advised to use the new Grafana 8 Alerts only if they have one organisation. Otherwise, silences for the Grafana managed alerts will be visible by all organizations.
 
 ## Add a silence