Update demos/example-nextjs/README.md

Co-authored-by: benitav <benitav@users.noreply.github.com>

Author: rkistner

demos/example-nextjs/README.md

@@ -5,6 +5,6 @@ This example is built using [Next.js](https://nextjs.org/) and the [PowerSync JS
 To see it in action:
 
 1. Make sure to run `pnpm build:packages` in the root directory of this Git repo.
-2. Copy `.env.local.template` to `.env.local`, and complete the environment variables. You can generate a temporary development token on the PowerSync dashboard, or leave blank to test with local-only data.
+2. Copy `.env.local.template` to `.env.local`, and complete the environment variables. You can generate a [temporary development token](https://docs.powersync.com/usage/installation/authentication-setup/development-tokens), or leave blank to test with local-only data.
 3. `pnpm start`
 4. Open the localhost URL in the browser displayed in the terminal output.