Update _index.md (#92790)

Update to explain grafana_net is older and grafana_com is the preferred config name. However, grafana_net config is still accepted and parsed to grafana_com config.

docs/sources/setup-grafana/configure-grafana/_index.md

@@ -1901,9 +1901,8 @@ Graphite metric prefix. Defaults to `prod.grafana.%(instance_name)s.`
 
 ## [grafana_net]
 
-### url
-
-Default is https://grafana.com.
+Refer to [grafana_com] config as that is the new and preferred config name.
+The grafana_net config is still accepted and parsed to grafana_com config.
 
 <hr>
 
@@ -1912,6 +1911,7 @@ Default is https://grafana.com.
 ### url
 
 Default is https://grafana.com.
+The default authentication identity provider for Grafana Cloud.
 
 <hr>