Make scalingo doc clearer

docs/Running-Mastodon/Scalingo-guide.md

@@ -8,6 +8,6 @@ Scalingo guide
   * You can use a .scalingo.io domain, which will be simple to set up, or you can use a custom domain.
   * You will want Amazon S3 for file storage. The only exception is for development purposes, where you may not care if files are not saved. Follow a guide online for creating a free Amazon S3 bucket and Access Key, then enter the details.
   * If you want your Mastodon to be able to send emails, configure SMTP settings here (or later). Consider using [Mailgun](https://mailgun.com) or similar, who offer free plans that should suit your interests.
-3. Deploy! The app should be set up, with a working web interface and database. You can change settings and manage versions from the Heroku dashboard.
+3. Deploy! The app should be set up, with a working web interface and database. You can change settings and manage versions from the Scalingo dashboard.
 
-You may need to use the `scalingo` CLI application to run `USERNAME=yourUsername rails mastodon:make_admin` to make yourself an admin.
+To make yourself an admin, you can use the `scalingo` CLI: `scalingo run -e USERNAME=yourusername rails mastodon:make_admin`.