bug#30552: 27.0.50; Incorrect link to Early Init File node and Early Init File clarification

[Radon Rosborough]

> there should be some way for a user to figure out if a variable

> *needs to be* in early-init.el or *can be* in init.el.

The set of variables which need to be set in early-init.el is exactly

the same as the set of variables which need to be set before

`package-initialize' is run, and hasn't changed as a result of this

patch. I do agree that adding explicit documentation of these

variables would be a good thing, though.