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

[Eli Zaretskii]

> From: Kaushal Modi <kaushal.modi@gmail.com>
> Date: Tue, 20 Feb 2018 17:47:32 +0000
> Cc: radon.neon@gmail.com
> 
>    To keep Emacs from automatically making packages available at
> startup, change the variable ‘package-enable-at-startup’ to ‘nil’.  You
> must do this in the early init file (*note (elisp)Early Init File::), as
> 
> in (emacs) Package Installation
> 
> It looks like the (elisp)Early Init File node does not exist.. navigating 
> there gives:
> 
> user-error: No such node or anchor: ‘Early Init File’

Fixed, thanks.