docs(toh-pt6,guide): fix a grammatical error

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

@@ -1182,7 +1182,7 @@ h3#merge-hero-routes Import hero module into AppModule
   We imported the `HeroesModule` and added it to our `AppModule`'s `imports`.
 
   We removed the `HeroListComponent` from the `AppModule`'s `declarations` because its being provided by the `HeroesModule`
-  now. This is important because their can be only **one** owner for a declared component. In our case, the `Heroes` module is
+  now. This is important because there can be only **one** owner for a declared component. In our case, the `Heroes` module is
   the owner of the `Heroes` components and is making them available to the `AppModule`.
 
 .l-sub-section

public/docs/ts/latest/tutorial/toh-pt6.jade

@@ -155,7 +155,7 @@ block get-heroes-details
     *Observables* are a powerful way to manage asynchronous data flows.
     We'll learn about [Observables](#observables) later in this chapter.
 
-    For *now* we get back on familiar ground by immediately by
+    For *now* we get back on familiar ground by immediately
     converting that `Observable` to a `Promise` using the `toPromise` operator.
 
   +makeExcerpt('app/hero.service.ts', 'to-promise', '')