docs(browser): getLocationAbsUrl returns a promise to a string (#3435)

closes #3398

Author: cnishina

lib/browser.ts

@@ -900,7 +900,7 @@ export class Browser extends Webdriver {
    * browser.get('http://angular.github.io/protractor/#/api');
    * expect(browser.getLocationAbsUrl())
    *     .toBe('http://angular.github.io/protractor/#/api');
-   * @returns {string} The current absolute url from AngularJS.
+   * @returns {webdriver.promise.Promise<string>} The current absolute url from AngularJS.
    */
   getLocationAbsUrl(): webdriver.promise.Promise<any> {
     this.waitForAngular();