docs(tutorial): change regexp so that assertion works

Need to remove this single space for the regex to work here.

Apparently `getText()` is trimming the text content or something, because there is no good reason
why that space should not be there.

Closes #6985

Author: yilinglu

docs/content/tutorial/step_03.ngdoc

@@ -172,7 +172,7 @@ ngBindTemplate} directives, which are invisible to the user while the page is lo
     it('should display the current filter value within an element with id "status"',
         function() {
       var statusElement = element(by.id('status'));
-      expect(statusElement.getText()).toMatch(/Current filter: \s*$/);
+      expect(statusElement.getText()).toMatch(/Current filter:\s*$/);
 
       element(by.model('query')).sendKeys('nexus');