fix: Fix grammar issues on README.md (vercel#54921)

In this PR resolved the grammatical error on the [README.md](https://github.com/vercel/next.js/blob/canary/examples/with-passport-and-next-connect/README.md)

Fixes vercel#54919

Author: okoyecharles

examples/with-passport-and-next-connect/README.md

@@ -4,7 +4,7 @@ This example creates a basic [CRUD](https://en.wikipedia.org/wiki/Create,_read,_
 
 The example shows how to do a sign up, login, logout, and account deactivation. It utilizes [SWR](https://swr.vercel.app/) to fetch the API.
 
-For demo purpose, the users database is stored in the cookie session. You need to replace it with an actual database to store users in [db.js](lib/db.js).
+For demo purposes, the users database is stored in the cookie session. You need to replace it with an actual database to store users in [db.js](lib/db.js).
 
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