A simple typo in Developer Guides -> Creating a channel

https://github.com/ethereum-push-notification-service/push-dev-docs/tree/main/developer-guides/create-your-notif-channel

In the final section "How to setup your channel" after the 4th step its repeated again as 5th step, 6th and so on.
![image](https://user-images.githubusercontent.com/58821810/205403326-146c4673-c2fa-4b13-866e-52c10cb35e57.png)
