protected GridBagLayout methods use GridBagLayoutInfo, which isn't documented

Maybe you already know this, but GridBagLayout has some
protected methods that use GridBagLayoutInfo, a helper
class that's defined in GridBagLayout.java.

I'm sure this happens elsewhere. It'd be good to check
one day....

Anyway, the result is a bogus link in the API, plus unusable
(I presume) methods. Yawn.