docs($http): fix broken markdown link in withCredentials description

Markdown typo in $http config documentation

Closes angular#7859

Author: joeyyang

src/ng/http.js

@@ -505,7 +505,7 @@ function $HttpProvider() {
      *    - **timeout** – `{number|Promise}` – timeout in milliseconds, or {@link ng.$q promise}
      *      that should abort the request when resolved.
      *    - **withCredentials** - `{boolean}` - whether to set the `withCredentials` flag on the
-     *      XHR object. See [requests with credentials]https://developer.mozilla.org/en/http_access_control#section_5
+     *      XHR object. See [requests with credentials](https://developer.mozilla.org/en-US/docs/Web/HTTP/Access_control_CORS#Requests_with_credentials)
      *      for more information.
      *    - **responseType** - `{string}` - see
      *      [requestType](https://developer.mozilla.org/en-US/docs/DOM/XMLHttpRequest#responseType).