Updating to reflect ACTUAL default $resource actions

Request Type: docs

How to reproduce: Look at the docs for $resource

Component(s): ngResource

Impact: large

Complexity: small

This issue is related to: 

**Detailed Description:**

The docs seemed to be off. I can't imagine that the default $resource would create 2 DELETE actions.

**Other Comments:**

I updated the documentation for what looks to be some incorrect documentation. I updated it with what I'm guessing is correct, but that doesn't mean it is. Please review and tweak as necessary.