chore: fix file name

Author: dreamorosi

examples/snippets/event-handler/rest/gettingStarted_route_prefix.ts

@@ -0,0 +1,15 @@
+declare function getUserTodos(auth: string | null): Promise<{ id: string }>;
+
+import { Router } from '@aws-lambda-powertools/event-handler/experimental-rest';
+import type { Context } from 'aws-lambda';
+
+const app = new Router({ prefix: '/todos' });
+
+// matches POST /todos
+app.post('/', async ({ req: { headers } }) => {
+  const todos = await getUserTodos(headers.get('Authorization'));
+  return { todos };
+});
+
+export const handler = async (event: unknown, context: Context) =>
+  app.resolve(event, context);