Implemented QE Review feedback for Getting started with the rhoas CLI for Red Hat OpenShift Streams for Apache Kafka (#426)

* In README.adoc of rhoas-cli-getting-started-kafka, amended admonition block in Creating a Kafka topic procedure, removed 4 spaces from json code snippet and clarified service-account and clientID correlation in Creating a service account procedure.

* Amended wording of service-account and clientID correlation in Creating a service account procedure.

* Put inverted commas around clientID in step 3 of the Creating a service account procedure.

Author: AedinC

docs/kafka/rhoas-cli-getting-started-kafka/README.adoc

@@ -171,7 +171,7 @@ view the `credentials.json` file that you created.
 {
 	"clientID":"srvc-acct-8c95ca5e1225-94a-41f1-ab97-aacf3df1",
 	"clientSecret":"facf3df1-ab97-2253-aa87-ab97",
-        "oauthTokenUrl": "https://identity.api.openshift.com/auth/realms/rhoas/protocol/openid-connect/token"
+    "oauthTokenUrl": "https://identity.api.openshift.com/auth/realms/rhoas/protocol/openid-connect/token"
 }
 ----
 You use these credentials and the bootstrap server URL to connect your applications and services to your Kafka instance.
@@ -180,7 +180,7 @@ You use these credentials and the bootstrap server URL to connect your applicati
 . Set the permissions for your service account to access the Kafka instance resources.
 +
 --
-This example allows applications to produce and consume messages from topics starting with a specified prefix that belong to any consumer group.
+This example allows applications to produce and consume messages from topics starting with a specified prefix that belong to any consumer group. The service account information you input here is the 'clientID' from the previous step.
 
 .Assigning access permissions to a service account
 [source,shell]
@@ -204,8 +204,13 @@ After creating a Kafka instance, you can create Kafka topics to start producing
 
 [NOTE]
 ====
-You can use `rhoas kafka use` to switch to a specific Kafka instance.
+You can use `rhoas kafka list` and `rhoas kafka use` to switch to a specific Kafka instance.
 
+.List Kafka instances
+[source,shell]
+----
+$ rhoas kafka list
+----
 .Selecting a Kafka instance to use
 [source,shell]
 ----