Explain SASL access only IP ranges

[glguy]

No description provided.

[bigpresh]

Looks sensible, and a good complement to freenode/ircd-seven#182 to make the explanation of SASL-only ranges easier to find.

In fact, I wonder if this content should be moved up above the list of client configuration links, so we more fully describe what SASL auth is and why it's required from some ranges, before telling you how to set it up in your client?

[glguy]

@bigpresh my reasoning for putting it at the bottom of the page is that I think most users are configuring SASL voluntarily because they want a cloak applied upon connection rather than because they are acting through a restricted IP.

I'm open to having it wherever it makes sense to everyone though