Help mode binding of `?' - command to give info on thing at point or mode

[Drew Adams]

`?' in Help mode is currently bound to `describe-mode'.

How about, instead, binding `?' to a command that gives you information on
the name at point, when appropriate, and does `describe-mode' (as a
fall-back) otherwise?

If the name at point names more than one thing (e.g. function, variable,
face), then the `?' command could ask which you want.