Updating dox for mod_rest. Ideas expressed / clarified: 1) Making clear that mod_rest isn't to be installed under VirtualHosts AND as a component. 2) Understanding some of the implications of this choice: A) Changes to user authentication B) How it affects subdomains 3) More consistent use of domain names for clarity. 4) Using different heading sizes to show scope of section. Essentially, I added all the tidbits I had to clarify in getting this to work in my own example.

---
labels:
- 'Stage-Stable'
summary: 'XEP-0279: Server IP Check'
...

Introduction
============

Sometimes for various reasons a client might want to know its IP address
as it appears to the server. This [simple
XEP](http://xmpp.org/extensions/xep-0279.html) allows the client to ask
the server for the IP address it is connected from.

Compatibility
=============

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  0.7   Works
  0.6   Works
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