docs(cookbook/graphql): Fix example files in article

Author: Urigo

public/docs/ts/latest/cookbook/graphql.jade

@@ -413,11 +413,11 @@ block file-summary
   )
 
   +makeTabs(
-   `toh-6/ts/app/app-routing.module.ts,
-    toh-6/ts/app/hero-search.component.ts,
-    toh-6/ts/app/hero-search.component.html,
-    toh-6/ts/app/hero-search.component.css,
-    toh-6/ts/app/rxjs-extensions.ts`,
+   `heroes-graphql/ts/app/app-routing.module.ts,
+    heroes-graphql/ts/app/hero-search.component.ts,
+    heroes-graphql/ts/app/hero-search.component.html,
+    heroes-graphql/ts/app/hero-search.component.css,
+    heroes-graphql/ts/app/rxjs-extensions.ts`,
     null,
    `app-routing.modules.ts,
     hero-search.component.ts,