docs(http): Small typo fix in sentence reference to items: Observable

Ward tacked on router: ngDestroy -> ngOnDestroy
closes #1690

Author: stephenjfox

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

@@ -739,7 +739,7 @@ h4#snapshot <i>Snapshot</i>: the no-observable alternative
   be re-used. We'll always re-create the component each time we navigate to it.
 
   The router offers a *Snapshot* alternative that gives us the initial value of the route parameters.
-  We don't need to subscribe. We don't have to unsubscribe in `ngDestroy`.
+  We don't need to subscribe. We don't have to unsubscribe in `ngOnDestroy`.
   It's much simpler to write and read:
 +makeExample('router/ts/app/heroes/hero-detail.component.2.ts','snapshot')(format=".")
 .l-sub-section

public/docs/ts/latest/guide/server-communication.jade

@@ -540,7 +540,7 @@ block wikipedia-jsonp+
     The component presents an `<input>` element *search box* to gather search terms from the user. 
     and calls a `search(term)` method after each `keyup` event.
 
-    The `search(term)` method delegates to our `WikipediaService` which returns an observable array of string results (`Observable<string[]`). 
+    The `search(term)` method delegates to our `WikipediaService` which returns an observable array of string results (`Observable<string[]>`). 
     Instead of subscribing to the observable inside the component as we did in the `HeroListComponent`, 
     we forward the observable result to the template (via `items`) where the [async pipe](pipes.html#async-pipe)
     in the `ngFor` handles the subscription.