docs: fix typos (#3155)

Author: charleshypk

public/docs/_examples/dependency-injection/ts/app/heroes/hero.service.1.ts

@@ -5,5 +5,5 @@ import { HEROES }     from './mock-heroes';
 
 @Injectable()
 export class HeroService {
-  getHeroes() { return HEROES;  }
+  getHeroes() { return HEROES; }
 }

public/docs/_examples/dependency-injection/ts/app/providers.component.ts

@@ -194,7 +194,7 @@ export class Provider8Component {
   template: template,
   /*
    // #docregion providers-9-interface
-   // FAIL!  Can't use interface as provider token
+   // FAIL! Can't use interface as provider token
    [{ provide: AppConfig, useValue: HERO_DI_CONFIG })]
    // #enddocregion providers-9-interface
    */

public/docs/_examples/user-input/ts/app/keyup.components.ts

@@ -20,7 +20,7 @@ export class KeyUpComponent_v1 {
 // #enddocregion key-up-component-1-class, key-up-component-1-class-no-type
   /*
   // #docregion key-up-component-1-class-no-type
-  onKey(event:any) { // without type info
+  onKey(event: any) { // without type info
     this.values += event.target.value + ' | ';
   }
   // #enddocregion key-up-component-1-class-no-type

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

@@ -70,7 +70,7 @@ a#declarations
 
 .alert.is-important
    :marked
-      **Only _declarables_** — _components_, _directives_ and _pipes_ — belong in the `declarations` array.  
+      **Only _declarables_** — _components_, _directives_ and _pipes_ — belong in the `declarations` array. 
       Don't put any other kind of class in `declarations`; _not_ `NgModule` classes, _not_ service classes, _not_ model classes.
 
 a#bootstrap-array
@@ -110,7 +110,7 @@ l-main-section
   bootstraps the `AppModule` described above.
 
   The _bootstrapping_ process sets up the execution environment,
-  digs the _root_ `AppComponent` out of the module's `bootstrap` array,  
+  digs the _root_ `AppComponent` out of the module's `bootstrap` array, 
   creates an instance of the component and inserts it within the element tag identified by the component's `selector`.
 
   The `AppComponent` selector — here and in most documentation samples — is `my-app`