provider/aws: Updating the Elastic MapReduce Cluster Instance Group Docs (#13286)

* Updating the AWS EMR Instance Group docs to fix #13272

* Required -> Optional

website/source/docs/providers/aws/r/emr_instance_group.html.md

@@ -8,9 +8,8 @@ description: |-
 
 # aws\_emr\_instance\_group
 
-Provides an Elastic MapReduce Cluster Instance Group configuration. 
-See [Amazon Elastic MapReduce Documentation](http://docs.aws.amazon.com/en_en/ElasticMapReduce/latest/ManagementGuide/InstanceGroups.html) 
-for more information. 
+Provides an Elastic MapReduce Cluster Instance Group configuration.
+See [Amazon Elastic MapReduce Documentation](https://aws.amazon.com/documentation/emr/) for more information.
 
 ~> **NOTE:** At this time, Instance Groups cannot be destroyed through the API nor
 web interface. Instance Groups are destroyed when the EMR Cluster is destroyed.
@@ -19,7 +18,7 @@ Terraform will resize any Instance Group to zero when destroying the resource.
 ## Example Usage
 
 ```
-resource "aws_emr_cluster_instance_group" "task" {
+resource "aws_emr_instance_group" "task" {
   cluster_id     = "${aws_emr_cluster.tf-test-cluster.id}"
   instance_count = 1
   instance_type  = "m3.xlarge"
@@ -30,21 +29,25 @@ resource "aws_emr_cluster_instance_group" "task" {
 ## Argument Reference
 
 The following arguments are supported:
+* `name` (Required) Human friendly name given to the instance group. Changing this forces a new resource to be created.
+* `cluster_id` (Required) ID of the EMR Cluster to attach to. Changing this forces a new resource to be created.
+* `instance_type` (Required) The EC2 instance type for all instances in the instance group. Changing this forces a new resource to be created.
+* `instance_count` (Optional) Target number of instances for the instance group. Defaults to 0.
+* `ebs_optimized` (Optional) Indicates whether an Amazon EBS volume is EBS-optimized. Changing this forces a new resource to be created.
+* `ebs_config` (Optional) One or more `ebs_config` blocks as defined below. Changing this forces a new resource to be created.
 
-* `name` - (Optional) Optional human friendly name for this Instance Group
-* `cluster_id` - (Required) ID of the EMR Cluster to attach to
-* `instance_type` - (Required) Type of instances for this Group
-* `instance_count` - (Optional) Count of instances to launch
+`ebs_config` supports the following:
+* `iops` - (Optional) The number of I/O operations per second (IOPS) that the volume supports.
+* `size` - (Optional) The volume size, in gibibytes (GiB). This can be a number from 1 - 1024. If the volume type is EBS-optimized, the minimum value is 10.
+* `type` - (Optional) The volume type. Valid options are 'gp2', 'io1' and 'standard'.
+* `volumes_per_instance` - (Optional) The number of EBS Volumes to attach per instance.
 
+## Attributes Reference
 
+The following attributes are exported:
 
-## ec2\_attributes
+* `id` - The EMR Instance ID
 
-Attributes for the Instance Group
+* `running_instance_count` The number of instances currently running in this instance group.
 
-* `name` - Human friendly name for this Instance Group
-* `cluster_id` - ID of the EMR Cluster the group is attached to
-* `instance_type` - Type of instances for this Group
-* `instance_count` - Count of desired instances to launch
-* `running_instance_count` - Count of actual running instances in the group
-* `status` - State of the instance group. One of `PROVISIONING`, `BOOTSTRAPPING`, `RUNNING`, `RESIZING`, `SUSPENDED`, `TERMINATING`, `TERMINATED`, `ARRESTED`, `SHUTTING_DOWN`, `ENDED`
+* `status` The current status of the instance group.