I’m not sure if I understand. If the actual behavior and common parameters come from amazon.aws, the docs fragments should also. This way, both would automatically be aligned.
Oh, wait! Let’s say c.a supports a.a X and later. If there’s a new a.a release Y with changes to common parameters, it’s not clear what docs fragments are the correct ones: Those from a.a X or a.a Y? After all, it depends on the a.a version people have installed. Is this what you’re meaning?