Clarify helm installation when using IAM roles or not (#2265)

* Clarify helm installation when using IAM roles or not

* Update docs/deploy/installation.md

Co-authored-by: Kishor Joshi <[email protected]>

Author: Yasumoto

docs/deploy/installation.md

@@ -85,11 +85,14 @@ curl -o iam-policy.json https://raw.githubusercontent.com/kubernetes-sigs/aws-lo
         !!!tip
             The `helm install` command automatically applies the CRDs, but `helm upgrade` doesn't.
 
+        !!!tip
+            Only run one of the two following `helm install` commands depending on whether or not your cluster uses IAM roles for service accounts.
+
     1. Install the helm chart if using IAM roles for service accounts. **NOTE** you need to specify both of the chart values `serviceAccount.create=false` and `serviceAccount.name=aws-load-balancer-controller`
     ```
     helm install aws-load-balancer-controller eks/aws-load-balancer-controller -n kube-system --set clusterName=<cluster-name> --set serviceAccount.create=false --set serviceAccount.name=aws-load-balancer-controller
     ```
-    1. Install the helm chart if not using IAM roles for service accounts
+    1. Install the helm chart if **not** using IAM roles for service accounts
     ```
     helm install aws-load-balancer-controller eks/aws-load-balancer-controller -n kube-system --set clusterName=<cluster-name>
     ```