Incorrect indentation of storageClassName parameter in the Lokistack CR under Logging 6.0 documentation

- Inside `About Logging 6.0` [1]  section in `Quick Start` [2] , the step number 2, Create a LokiStack custom resource (CR) in the openshift-logging namespace: `storageClassName` is wrongly mentioned.

[1] https://docs.openshift.com/container-platform/4.16/observability/logging/logging-6.0/log6x-about.html
[2] https://docs.openshift.com/container-platform/4.16/observability/logging/logging-6.0/log6x-about.html#quick-start

- Here is the current configuration:
~~~
apiVersion: loki.grafana.com/v1
kind: LokiStack
metadata:
  name: logging-loki
  namespace: openshift-logging
spec:
  managementState: Managed
  size: 1x.extra-small
  storage:
    schemas:
    - effectiveDate: '2022-06-01'
      version: v13
    secret:
      name: logging-loki-s3
      type: s3
    storageClassName: gp3-csi
  tenants:
    mode: openshift-logging
~~~

- `storageClassName` parameter indentation is wrong here.

- Here is the correct configuration:
~~~
apiVersion: loki.grafana.com/v1
kind: LokiStack
metadata:
  name: logging-loki
  namespace: openshift-logging
spec:
  managementState: Managed
  size: 1x.extra-small
  storage:
    schemas:
    - effectiveDate: '2022-06-01'
      version: v13
    secret:
      name: logging-loki-s3
      type: s3
    storageClassName: gp3-csi
  tenants:
    mode: openshift-logging
~~~

Author: prithvipatil97

observability/logging/logging-6.0/log6x-about.adoc

@@ -62,7 +62,7 @@ spec:
     secret:
       name: logging-loki-s3
       type: s3
-    storageClassName: gp3-csi
+  storageClassName: gp3-csi
   tenants:
     mode: openshift-logging
 ----