Update instance_type description to feature up-to-date list of instance types. Matches format of 'ebs_optimized' param which also includes a link.
Update region description to feature up-to-date list of ec2 regions. Matches format of 'ebs_optimized' param which also includes a link.
Updated choices for monitoring param to be explicit bool matching default 'yes'.
Updated choices for source_dest_check to be explicit bool matching default 'true'.
Updated tenancy choices to remove redundant phrasing in comments.
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