@hqhq you should describe what Exec actually does. The fact that implements the Driver interface is a good additional piece of information but secondary.

(same for the other comments)

@tiborvass Since all these methods in different exec drivers have almost same purpose, and their docs are mostly the same, so as suggested in #14848 (comment), #14848 expended docs in Driver interface, docs for method like Exec can be found in the interface, we can only maintain pertinent details required for these particular implementations.