Re: Faces customization group linked from mode groups

[Richard M. Stallman]

    There is nothing bad not having a parent documentation link, since the
    user can go to the parent group, and find the same link in the parent
    customization buffer.

I agree.  However, I don't see how this relates to the issue.
The question was how to make it easy to find all the faces
you could customize that affect Font Lock mode, right?
What is the solution you propose?