docs(graphql-cookbook): Fix lint errors

Author: Urigo

public/docs/_examples/heroes-graphql-starter/ts/src/app/schema.ts

@@ -35,4 +35,4 @@ schema {
   query: Query
   mutation: Mutation
 }
-`;
+`;

public/docs/_examples/heroes-graphql/ts/src/app/app.module.1.ts

@@ -51,4 +51,4 @@ import { HeroSearchComponent }  from './hero-search.component';
   // #enddocregion search
   bootstrap: [ AppComponent ]
 })
-export class AppModule { }
+export class AppModule { }

public/docs/_examples/heroes-graphql/ts/src/app/mockedNetworkInterface.ts

@@ -1,6 +1,6 @@
 // #docregion
 // #docregion imports
-import { 
+import {
   makeExecutableSchema,
   addMockFunctionsToSchema
 } from 'graphql-tools';

public/docs/_examples/heroes-graphql/ts/src/app/schema.ts

@@ -35,4 +35,4 @@ schema {
   query: Query
   mutation: Mutation
 }
-`;
+`;