Installation - Update installing-logging-operator-cli.adoc

- Several commands are included within a single code block.
Here is the documentation link:
https://docs.redhat.com/en/documentation/red_hat_openshift_logging/6.3/html/installing_logging/installing-logging#installing-logging-operator-cli_installing-logging

- As per the standard rule, using more than one command per code block is not recommended.
- Please check Standard rule  [2] for reference:
 [2] https://github.com/openshift/openshift-docs/blob/main/contributing_to_docs/doc_guidelines.adoc#single-command-per-code-block

- When commands are bunched together, the copy to clipboard functionality might not break the lines up correctly.
- Using a single command per code block makes it copy-and-paste friendly.
- Hence, we need to mention 3 separate code blocks for above 3 commands. Here is the updated look of the documentation:
~~~
$ oc adm policy add-cluster-role-to-user logging-collector-logs-writer -z logging-collector -n openshift-logging
~~~
~~~
$ oc adm policy add-cluster-role-to-user collect-application-logs -z logging-collector -n openshift-logging
~~~
~~~
$ oc adm policy add-cluster-role-to-user collect-infrastructure-logs -z logging-collector -n openshift-logging
~~~

Author: prithvipatil97

modules/installing-logging-operator-cli.adoc

@@ -79,7 +79,15 @@ $ oc create sa logging-collector -n openshift-logging
 [source,terminal]
 ----
 $ oc adm policy add-cluster-role-to-user logging-collector-logs-writer -z logging-collector -n openshift-logging
+----
++
+[source,terminal]
+----
 $ oc adm policy add-cluster-role-to-user collect-application-logs -z logging-collector -n openshift-logging
+----
++
+[source,terminal]
+----
 $ oc adm policy add-cluster-role-to-user collect-infrastructure-logs -z logging-collector -n openshift-logging
 ----