AWS permissions update

Author: codyhoag

modules/installation-aws-permissions.adoc

@@ -14,7 +14,6 @@ cluster, the IAM user requires the following permissions:
 .Required EC2 permissions for installation
 [%collapsible]
 ====
-* `tag:UntagResources`
 * `ec2:AllocateAddress`
 * `ec2:AssociateAddress`
 * `ec2:AuthorizeSecurityGroupEgress`
@@ -227,7 +226,7 @@ If you use an existing VPC, your account does not require these permissions for
 
 [NOTE]
 =====
-If you use an existing VPC, your account does not require these permissions to delete network resources.
+If you use an existing VPC, your account does not require these permissions to delete network resources. Instead, your account only requires the `tag:UntagResources` permission to delete network resources.
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