Example to create multiple instances

### Describe the Feature

I'd like to know how to modify this example https://github.com/cloudposse/terraform-aws-ec2-instance/blob/master/examples/complete/main.tf for multiple EC2 instances

### Expected Behavior

NA

### Use Case

Bringing up a small networked cluster

### Describe Ideal Solution

A similar example in the examples folder for multiple networked EC2 instances from custom AMI.

### Alternatives Considered

_No response_

### Additional Context

_No response_