Adds some additional docs about the module parameters for s3
and ec2 modules.

Add some details in the docs about how the id parameter of the ec2
module behaves.

Remove the reference to the unused "termination_list" parameter
in the ec2 module. The instance_ids parameter is the one that contains
the list of instance ids to be terminated.

In the ec2 module, if an id is specified, check if there have been
any changes. If not, return changed=False

Fixes #3746

Pass in the `instances` output of the ec2 module
to terminate a list of instances that were previously provisioned.

Useful for automated testing.

Both modules seboolean and zfs have not been adapted since they defer from the default (either by having a 'null' or special state, or prefering "on"/"off" for state indication.