Mention manual rebuild step

Author: simolus3

demos/example-electron-node/README.md

@@ -20,7 +20,8 @@ To see it in action:
 1. Make sure to run `pnpm install` and `pnpm build:packages` in the root directory of this repo.
 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.
    The example works with the schema from the [PowerSync + Supabase tutorial](https://docs.powersync.com/integration-guides/supabase-+-powersync#supabase-powersync).
-3. `cd` in this directory and run `pnpm start`.
+3. `cd` into this directory. In this mono-repo, you'll have to run `./node_modules/.bin/electron-rebuild` once to make sure `@powersync/better-sqlite3` was compiled with Electron's toolchain.
+3. Finally, run `pnpm start`.
 
 Apart from the build setup, this example is purposefully kept simple.
 To make sure PowerSync is working, you can run `await powersync.get('SELECT powersync_rs_version()');` in the DevTools