docs(cookbook/graphql): fix lint error

Author: Urigo

public/docs/_examples/heroes-graphql/ts/app/hero-detail.component.ts

@@ -56,7 +56,6 @@ export class HeroDetailComponent implements OnInit {
 
   // #docregion save
   save(): void {
-    
     this.apollo.mutate({
       mutation: gql`
         mutation updateHero($id: Int!, $name: String!) {

public/docs/_examples/heroes-graphql/ts/app/hero-search.component.ts

@@ -55,8 +55,7 @@ export class HeroSearchComponent implements OnInit {
             id
             name
           }
-        }
-      `,
+        }`,
       variables: {
         search: this.searchTerms
           .debounceTime(300)        // wait 300ms after each keystroke before considering the term