fix($xhr.error): fix docs and add missed breaking change

$xhr.error's first argument (request) has no callback property anymore,
it's called success now...

This breaking change was introduced by b5594a773a

CHANGELOG.md

@@ -70,6 +70,7 @@
   Angular with
   [Unicode Technical Standard #35](http://unicode.org/reports/tr35/#Date_Format_Patterns) used by
   Closure, as well as, future DOM apis currently being proposed to w3c.
+- `$xhr.error`'s `request` argument has no `callback` property anymore, use `success` instead
 
 
 

src/service/xhr.error.js

@@ -19,7 +19,7 @@
  *   - `method` – `{string}` – The http request method.
  *   - `url` – `{string}` – The request destination.
  *   - `data` – `{(string|Object)=} – An optional request body.
- *   - `callback` – `{function()}` – The callback function
+ *   - `success` – `{function()}` – The success callback function
  *
  * @param {Object} response Response object.
  *