Update cluster-logging-kibana-scaling.adoc

- Incorrect configuration under scaling redundancy for the log visualizer nodes documentation

- Here is the documentation link:
https://docs.openshift.com/container-platform/4.16/observability/logging/log_visualization/logging-kibana.html#cluster-logging-kibana-scaling_logging-kibana

=============
- namespace name is missing from the command.
- same command is mentioned twice in the second block. Which is not required and hence needs to be removed.
- "namespace: openshift-logging" field is missing under `metadata` section.
- 2 extra spaces under `spec.visulization`, it will not cause any effect. But it needs to be with correct indentation.
===========
===========
Reason:

1. Suppose the user is not a part of openshift-logging project, and he tries to run this command then this command will not work.
2. If the credentials are shared, and two people are using the same cluster at the same time, then, the second person could change to work in a different namespace.
===============

Updated documentation will look like the following:

1. Edit the ClusterLogging custom resource (CR) in the openshift-logging project:

~~~
$ oc -n openshift-logging edit ClusterLogging instance
~~~
~~~
apiVersion: "logging.openshift.io/v1"
kind: "ClusterLogging"
metadata:
  name: "instance"
  namespace: openshift-logging
....

spec:
  visualization:
    type: "kibana"
    kibana:
      replicas: 1 
~~~

Author: prithvipatil97

modules/cluster-logging-kibana-scaling.adoc

@@ -14,7 +14,7 @@ You can scale the pod that hosts the log visualizer for redundancy.
 +
 [source,terminal]
 ----
-$ oc edit ClusterLogging instance
+$ oc -n openshift-logging edit ClusterLogging instance
 ----
 +
 [source,yaml]
@@ -23,13 +23,13 @@ apiVersion: "logging.openshift.io/v1"
 kind: "ClusterLogging"
 metadata:
   name: "instance"
-
+  namespace: openshift-logging
 ....
 
 spec:
-    visualization:
-      type: "kibana"
-      kibana:
-        replicas: 1 <1>
+  visualization:
+    type: "kibana"
+    kibana:
+      replicas: 1 <1>
 ----
 <1> Specify the number of Kibana nodes.