Misleading comment in asdf.lisp

[Denis Budyak]

The following comment seem to be wrong:

;; Allow for naked :grovel-file and :wrapper-file in asdf definitions.
(setf (find-class 'asdf::cffi-grovel-file) (find-class 'grovel-file))

Indeed, after that, :cffi-grovel-file and :wrapper-file should be recognized as component name,
not :grovel-file and :wrapper-file.

This wrong comment is essential as there are two references from asdf manual to the code.

So the code should be considered as a "canonical example" of extending asdf.

Figuring out what is wrong required an essential effort from me.