docs(concepts): fix spelling error

docs/content/guide/concepts.ngdoc

@@ -425,7 +425,7 @@ function arguments. When angular calls the function, it will use the {@link
 api/AUTO.$injector#invoke call} which will automatically fill the function
 arguments.
 
-Examine the `ClockCtrl` bellow, and notice how it lists the dependencies in the constructor. When the
+Examine the `ClockCtrl` below, and notice how it lists the dependencies in the constructor. When the
 {@link api/ng.directive:ngController ng-controller} instantiates
 the controller it automatically provides the dependencies. There is no need to create
 dependencies, look for dependencies, or even get a reference to the injector.