upstream mdx change needed formatting

docs/02-app/01-building-your-application/09-authentication/index.mdx

@@ -536,7 +536,7 @@ Regardless of your choice, prioritize security in your session management strate
 
 Here are authentication solutions compatible with Next.js, please refer to the quickstart guides below to learn how to configure them in your Next.js application:
 
-{/* TODO: Change link to authjs.dev when new documentation is ready  */}
+{/* TODO: Change link to authjs.dev when new documentation is ready */}
 
 - [AuthO](https://auth0.com/docs/quickstart/webapp/nextjs/01-login)
 - [Clerk](https://clerk.com/docs/quickstarts/nextjs)