remove note, add list of dimensions (#4287)

Author: colleenmcginnis

docs/en/serverless/apm/apm-ui-services.mdx

@@ -47,19 +47,10 @@ To create a service group:
 1. Click **Create group**.
 1. Specify a name, color, and description.
 1. Click **Select services**.
-1. Specify a [Kibana Query Language (KQL)](((kibana-ref))/kuery-query.html) query to select
-   services for the group. Services that match the query within the last 24 hours will be assigned to the group.
-
-<DocCallOut title="Note">
-
-Once a service group has been saved, this list of services within it is static.
-If a newly added service matches the KQL query, it will not be automatically added to the service group.
-Similarly, if a service stops matching the KQL query, it will not be removed from the group.
-
-To update the list of services within a group,
-edit the service group, click **Refresh** next to the KQL query, and click **Save group**.
-
-</DocCallOut>
+1. Specify a [Kibana Query Language (KQL)](((kibana-ref))/kuery-query.html) query to filter services
+  by one or more of the following dimensions: `agent.name`, `service.name`, `service.language.name`,
+  `service.environment`, `labels.<xyz>`. Services that match the query within the last 24 hours will
+  be assigned to the group.
 
 ### Examples