fix: unneeded comma

doc/sprint0/product_backlog.md

@@ -31,7 +31,7 @@ interact and join experiences and events
 7. As a user, I want to be able to search other users based on experiences and preferences so that I can find people that I have things in common with
 8. As a user, I want to be able to search events so that I can find events to interact with
 9. As a user, I want to be able to see a board of events so I can click on the event and see what the event is about
-10. As a user, I want to be able to join events so it can show that I am a user, joining the event on the event page
+10. As a user, I want to be able to join events so it can show that I am a user joining the event on the event page
 11. As a user, I want to see recommendations of events based on my personal interests stated in my profile
 12. As a user, I want to be able to chat with other users so that I can coordinate meetings and events with them
 13. As a user, I want to be able to see invitations to events by other users so that I can accept or decline the invitations