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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
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```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
```

"""
    Check if Boto library has a <param> in its request_spot_instances() method. For example, the placement_group parameter wasn't added until 2.3.0.
    ec2: authenticated ec2 connection object
    Returns:
        True if boto library has the named param as an argument on the request_spot_instances method, else False
    """
    method = getattr(ec2, 'request_spot_instances')
    return param in get_function_code(method).co_varnames
def await_spot_requests(module, ec2, spot_requests, count):
    """
    Wait for a group of spot requests to be fulfilled, or fail.
    module: Ansible module object
    ec2: authenticated ec2 connection object
    spot_requests: boto.ec2.spotinstancerequest.SpotInstanceRequest object returned by ec2.request_spot_instances
    count: Total number of instances to be created by the spot requests
    Returns:
        list of instance ID's created by the spot request(s)
    """
    spot_wait_timeout = int(module.params.get('spot_wait_timeout'))
    wait_complete = time.time() + spot_wait_timeout
    spot_req_inst_ids = dict()
    while time.time() < wait_complete:
        reqs = ec2.get_all_spot_instance_requests()
        for sirb in spot_requests:
            if sirb.id in spot_req_inst_ids:
                continue
            for sir in reqs:
                if sir.id != sirb.id:
                    continue  
                if sir.instance_id is not None: