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##### SUMMARY
<!--- Explain the problem briefly below -->
Ansible currently contains two modules for managing AWS EC2 instances: [`ec2`](https://docs.ansible.com/ansible/latest/modules/ec2_module.html) and [`ec2_instance`](https://docs.ansible.com/ansible/latest/modules/ec2_instance_module.html).

There is considerable overlap between the modules, but it's unclear what the differences are and why there are two modules in the first place.

##### ISSUE TYPE
- Documentation Report

##### COMPONENT NAME
<!--- Write the short name of the module, plugin, task or feature below, use your best guess if unsure -->
ec2
ec2_instance

##### ANSIBLE VERSION
<!--- Paste verbatim output from "ansible --version" between quotes -->
```paste below
ansible 2.10.0.dev0
  config file = /home/user/.ansible.cfg
  configured module search path = ['/home/user/.ansible/plugins/modules', '/usr/share/ansible/plugins/modules']
  ansible python module location = /home/user/ansible/lib/ansible
  executable location = /home/user/ansible/bin/ansible
  python version = 3.7.5 (default, Oct 27 2019, 15:43:29) [GCC 9.2.1 20191022]
```

##### CONFIGURATION
<!--- Paste verbatim output from "ansible-config dump --only-changed" between quotes -->
```paste below
RETRY_FILES_ENABLED(/home/user/.ansible.cfg) = False
```

##### OS / ENVIRONMENT
<!--- Provide all relevant information below, e.g. target OS versions, network device firmware, etc. -->
Debian bullseye/sid

##### STEPS TO REPRODUCE
<!--- Describe exactly how to reproduce the problem, using a minimal test-case -->

<!--- Paste example playbooks or commands between quotes below -->
```yaml
N/A
```

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##### EXPECTED RESULTS
<!--- Describe what you expected to happen when running the steps above -->
N/A

##### ACTUAL RESULTS
<!--- Describe what actually happened. If possible run with extra verbosity (-vvvv) -->

<!--- Paste verbatim command output between quotes -->
```paste below
N/A
```

['network_interfaces', 'private_ip'],
            ['network_interfaces', 'vpc_subnet_id'],
        ],
    )
    if module.params.get('group') and module.params.get('group_id'):
        module.deprecate(
            msg='Support for passing both group and group_id has been deprecated. '
            'Currently group_id is ignored, in future passing both will result in an error',
            version='2.14')
    if not HAS_BOTO:
        module.fail_json(msg='boto required for this module')
    try:
        region, ec2_url, aws_connect_kwargs = get_aws_connection_info(module)
        if module.params.get('region') or not module.params.get('ec2_url'):
            ec2 = ec2_connect(module)
        elif module.params.get('ec2_url'):
            ec2 = connect_ec2_endpoint(ec2_url, **aws_connect_kwargs)
        if 'region' not in aws_connect_kwargs:
            aws_connect_kwargs['region'] = ec2.region
        vpc = connect_vpc(**aws_connect_kwargs)
    except boto.exception.NoAuthHandlerFound as e:
        module.fail_json(msg="Failed to get connection: %s" % e.message, exception=traceback.format_exc())
    tagged_instances = []
    state = module.params['state']
    if state == 'absent':
        instance_ids = module.params['instance_ids']
        if not instance_ids:
            module.fail_json(msg='instance_ids list is required for absent state')
        (changed, instance_dict_array, new_instance_ids) = terminate_instances(module, ec2, instance_ids)
    elif state in ('running', 'stopped'):