docs($location): explain difference between $location.host() and location.host.

Closes angular#11741
Closes angular#11744

Author: dnozay

src/ng/location.js

@@ -413,12 +413,20 @@ var locationPrototype = {
    * This method is getter only.
    *
    * Return host of current url.
+   * 
+   * Note: compared to the non-angular version `location.host` which returns `hostname:port`, this returns the `hostname` portion only.
    *
    *
    * ```js
    * // given url http://example.com/#/some/path?foo=bar&baz=xoxo
    * var host = $location.host();
    * // => "example.com"
+   * 
+   * // given url http://user:password@example.com:8080/#/some/path?foo=bar&baz=xoxo
+   * host = $location.host();
+   * // => "example.com"
+   * host = location.host;
+   * // => "example.com:8080"
    * ```
    *
    * @return {string} host of current url.