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

According to angular/protractor#3969, browser.getLocationAbsUrl() is now deprecated and it recommends using browser.getCurrentUrl instead

Author: alopezsanchez

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()).toBe('/phones/nexus-s');
     });
 
     ...

docs/content/tutorial/step_09.ngdoc

@@ -363,7 +363,7 @@ 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()).toBe('/phones');
   });
 
   ...