fix typo

Author: marvinhagemeister

src/app.ts

@@ -291,7 +291,7 @@ export class App<State> {
   }
 
   /**
-   * Insert file routes collected in {@linkcode Buidler} at this point.
+   * Insert file routes collected in {@linkcode Builder} at this point.
    * @param pattern Append file routes at this pattern instead of the root
    * @returns
    */