[w3c/push-api] Documentation: It's not clear how to specify the push service (Issue #355)

[The sequence diagram below](https://github.com/w3c/push-api/blob/gh-pages/images/sequence_diagram.png) shows that the web page subscribes to the user agent (no problem so far) and the user agent `subscribe()`s to the push service. However, it ...
1) ... is unclear (from the docs) how to specify the push service's location (URL/IP/...). 
2) ... seems currently not possible to specify the location of a push service. To me it looks like the user agent actually `subscribe()`s to the application server (as this is the only known target) and the application server "forwards"(?) the information to the push service.

![diagram](https://github.com/w3c/push-api/blob/gh-pages/images/sequence_diagram.png?raw=true)

It would be nice if the documentation could be more informative on this point.

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