Fixed a copy/paste error that resulted in the wrong command being documented...

Fixed a copy/paste error that resulted in the wrong command being documented for generating test email accounts.

boost-server/.env.example

@@ -128,7 +128,7 @@ NOREPLY_USERNAME=Boost Board Game
 # <https://ethereal.email/> by starting a `node` REPL in the server's directory
 # after an `npm install` and then running this code:
 #
-# > import('web-push').then((webPush) => console.log(webPush.default.generateVAPIDKeys()));
+# > import('nodemailer').then((nodemailer) => nodemailer.createTestAccount(console.log))
 #
 # Messages sent with this kind of fake account will not actually be delivered,
 # but they can still be viewed by visiting the URLs in the server's log