updates

modules/installation-aws-limits.adoc

@@ -35,8 +35,8 @@ more worker nodes, enable autoscaling, deploy large workloads, or use a
 different instance type, review your account limits to ensure that your cluster
 can deploy the machines that you need.
 
-In most regions, the bootstrap machine uses an `m4.large` machine and the
-master and worker machines use `m4.xlarge` machines. If these machine types
+In most regions, the bootstrap and worker machines uses an `m4.large` machines
+and the master machines use `m4.xlarge` machines. If these machine types
 are not available in the region that you select, `m5.large` and `m5.xlarge`
 machines are used instead.
 

modules/installation-creating-aws-control-plane.adoc

@@ -161,7 +161,7 @@ the CloudFormation template for the security group and roles.
 [IMPORTANT]
 ====
 If `m4` instance types are not available in your region, such as with
-`eu-west-3`, use `m5` types instead.
+`eu-west-3`, specify an `m5` type, such as `m5.xlarge`, instead.
 ====
 <23> Whether or not to register a network load balancer (NLB).
 <24> Specify `yes` or `no`. If you specify `yes`, you must provide a Lambda
@@ -182,12 +182,10 @@ and load balancing.
 . Copy the template from the *CloudFormation template for control plane machines*
 section of this topic and save it as a YAML file on your computer. This template
 describes the control plane machines that your cluster requires.
-+
-[IMPORTANT]
-====
-If `m4` instance types are not available in your region, such as with
-`eu-west-3`, you must modify the CloudFormation template use `m5` types.
-====
+
+. If you specified an `m5` instance type as the value for `MasterInstanceType`,
+add that instance type to the `MasterInstanceType.AllowedValues` parameter
+in the CloudFormation template.
 
 . Launch the template:
 +

modules/installation-creating-aws-worker.adoc

@@ -125,12 +125,10 @@ If `m4` instance types are not available in your region, such as with
 . Copy the template from the *CloudFormation template for worker machines*
 section of this topic and save it as a YAML file on your computer. This template
 describes the networking objects and load balancers that your cluster requires.
-+
-[IMPORTANT]
-====
-If `m4` instance types are not available in your region, such as with
-`eu-west-3`, you must modify the CloudFormation template use `m5` types.
-====
+
+. If you specified an `m5` instance type as the value for `WorkerInstanceType`,
+add that instance type to the `WorkerInstanceType.AllowedValues` parameter
+in the CloudFormation template.
 
 . Launch the template:
 +