[wp-docs] new Super Admin menu pages

[Jane Wells]

> My last thought was to NOT include anything but a sentence and a link 
> saying something like "If you are using Multisite/Network then visit 
> so and so...and then on that "so and so" article summarize and link  
> to the multisite/network subpanel(s).
Is her URL structure okay, though? Basically one of the things we need 
to RC today is to get the last help screens in (for the help tab, not in 
codex), and I need URLS to point to, knowing they won't be filled in 
until after RC, but getting it in before string freeze.

Jane