docs(tutorial): replace getLocationAbsUrl() with getCurrentUrl()

Protractor's `browser.getLocationAbsUrl()` has been deprecated and
`browser.getCurrentUrl()` is the recommended alternative.
Related: angular/angular-phonecat#430

Author: gkalpak

docs/content/tutorial/step_08.ngdoc

@@ -83,7 +83,7 @@ HTTP request to an invalid location.
       query.sendKeys('nexus');
 
       element.all(by.css('.phones li a')).first().click();
-      expect(browser.getLocationAbsUrl()).toBe('/phones/nexus-s');
+      expect(browser.getCurrentUrl()).toContain('index.html#!/phones/nexus-s');
     });
 
     ...

docs/content/tutorial/step_09.ngdoc

@@ -352,7 +352,7 @@ various URLs and verifying that the correct view was rendered.
 
   it('should redirect `index.html` to `index.html#!/phones', function() {
     browser.get('index.html');
-    expect(browser.getLocationAbsUrl()).toBe('/phones');
+    expect(browser.getCurrentUrl()).toContain('index.html#!/phones');
   });
 
   ...