Minor coding style update (#12229)

Author: roderickhsiao

docs/platforms/javascript/guides/nextjs/manual-setup.mdx

@@ -306,7 +306,7 @@ If you need additional logic within the `onRequestError` hook, call `captureRequ
 
 ```TypeScript {filename:instrumentation.ts}
 import * as Sentry from "@sentry/nextjs";
-import type { Instrumentation } from 'next';
+import type { Instrumentation } from "next";
 
 export const onRequestError: Instrumentation.onRequestError = (...args) => {
   Sentry.captureRequestError(...args);