Fixed minor typos in testing (#2515)

Fixed minor typos in testing

Author: Belax8

public/docs/ts/latest/guide/testing.jade

@@ -897,9 +897,9 @@ a(href="#top").to-top Back to top
   The testing goal is to verify that such bindings work as expected. 
   The tests should set input values and listen for output events.
 
-  The `DashboardHeroComponent` is tiny example of a component in this role.
-  It displays an individual heroe provided by the `DashboardComponent`. 
-  Clicking that hero tells the the `DashboardComponent` that the user has selected the hero.
+  The `DashboardHeroComponent` is a tiny example of a component in this role.
+  It displays an individual hero provided by the `DashboardComponent`. 
+  Clicking that hero tells the `DashboardComponent` that the user has selected the hero.
 
   The `DashboardHeroComponent` is embedded in the `DashboardComponent` template like this:
 +makeExample('testing/ts/app/dashboard/dashboard.component.html', 'dashboard-hero', 'app/dashboard/dashboard.component.html (excerpt)')(format='.')
@@ -1075,7 +1075,7 @@ a(href="#top").to-top Back to top
 +makeExample('testing/ts/app/dashboard/dashboard.component.spec.ts', 'router-stub', 'app/dashboard/dashboard.component.spec.ts (Router Stub)')(format='.')
 :marked
   Now we setup the testing module with the test stubs for the `Router` and `HeroService` and 
-  create a test instance of the `DashbaordComponent` for subsequent testing.
+  create a test instance of the `DashboardComponent` for subsequent testing.
 +makeExample('testing/ts/app/dashboard/dashboard.component.spec.ts', 'compile-and-create-body', 'app/dashboard/dashboard.component.spec.ts (compile and create)')(format='.')
 :marked
   The following test clicks the displayed hero and confirms (with the help of a spy) that `Router.navigateByUrl` is called with the expected url.
@@ -1266,7 +1266,7 @@ a(href="#top").to-top Back to top
 
   Fortunately, the `TestBed.configureTestingModule` parameter parallels
   the metadata passed to the `@NgModule` decorator 
-  which means you can also specify `providers` and `imports.
+  which means you can also specify `providers` and `imports`.
 
   The `HeroDetailComponent` requires a lot of help despite its small size and simple construction. 
   In addition to the support it receives from the default testing module `CommonModule`, it needs: