Re: "What's This?" in Describe submenu

[Richard M. Stallman]

    Here is the doc string:

     Give help on a key/menu sequence or object clicked with the mouse.

I thought describe-key would do that, but I see it doesn't give
useful information in these cases.

I think the right way to deal with this is to make describe-key
smarter, so that it gives useful information in these cases,
rather than making a special command to do it.   There is no logical
reason they should be two separate commands.