docs(graphql-cookbook): Fix inner property value

Author: Urigo

public/docs/_examples/heroes-graphql-starter/ts/plnkr.json

@@ -1,5 +1,5 @@
 {
-  "description": "Tour of Heroes: Part 6",
+  "description": "Tour of Heroes - GraphQL Starter",
   "basePath": "src/",
   "files":[
     "!**/*.d.ts",

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

@@ -15,5 +15,5 @@ import { Component }          from '@angular/core';
   styleUrls: ['./app.component.css']
 })
 export class AppComponent {
-  title = 'Tour of Heroes';
+  title = 'Tour of Heroes - GraphQL Starter';
 }