docs(tutorial/step_07): fix typo

Author: Jake Buob

docs/content/tutorial/step_07.ngdoc

@@ -97,7 +97,7 @@ service, the `$routeProvider` exposes APIs that allow you to define routes for y
 Angular modules solve the problem of removing global state from the application and provide a way
 of configuring the injector. As opposed to AMD or require.js modules, Angular modules don't try to
 solve the problem of script load ordering or lazy script fetching. These goals are totally independent and
-both module systems can live side by side and fulfil their goals.
+both module systems can live side by side and fulfill their goals.
 
 To deepen your understanding of DI on Angular, see
 [Understanding Dependency Injection](https://github.com/angular/angular.js/wiki/Understanding-Dependency-Injection).