docs: update grafana resource docs (#1842)

docs/docs/grafana.md

@@ -7,8 +7,7 @@ The grafana Custom Resource Definition (CRD) exist to manage one or multiple man
 
 ## Grafana config
 
-In version 4 of the operator, we defined all the configuration values that could be done in the CRD.
-In version 5, we no longer do that. Instead, we offer `grafana.config` field where you can pass any grafana configuration values you want.
+We offer the `grafana.config` field where you can pass any Grafana configuration values you want.
 
 The operator does not make any extra validation of your configuration, so just like a non-operator deployment of Grafana, your Grafana instance might be broken due to a configuration error.
 
@@ -69,11 +68,15 @@ spec:
 
 A more comprehensive example can be found [here](../examples/external_grafana/readme).
 
-## Organizations
+## Delete instances
 
-For grafana-operator v4, there have been multiple requests around adding support for Grafana organizations.
-There have been much design work around how it could be done, but no one have managed to come up with a good design that would be simple-to-use for end users and be easy-to-manage code-wise from maintainer's perspective.
+Deleting instances will clean up all associated resources *except* associated volumes.
+Persistent Volume Claims are not deleted to prevent data loss on accidental deletion.
+If you want to recreate an instance, be sure to delete the volume as well.
+Otherwise, the new instance will start up with the old database and encounter authentication issues.
 
-Since version 5 now supports multiple Grafana instances, we are taking the same stance as Grafana Cloud does meaning we will not support organizations in the operator.
+## Organizations
 
+There have been much design work around how it could be done, but no one have managed to come up with a good design that would be simple-to-use for end users and be easy-to-manage code-wise from maintainer's perspective.
 Instead we suggest that you use multiple grafana instances together with good CI/CD solutions to manage your dashboards, datasources, etc.
+If you really need support for organizations, you can use the `spec.client.headers` map to set the `X-Grafana-Org-Id` Header.