update doc

docs/source/create_competition.mdx

@@ -10,9 +10,6 @@ You can find/generate a write token [here](https://huggingface.co/settings/token
 To create a competition, you also need an organization. You can either create a new organization or use an existing one that you are already a member of.
 You can create a new organization [here](https://huggingface.co/organizations/new).
 
-Please make sure you attach a payment method to your organization. You can do so in organization settings.
-NOTE: your payment method will not be charged if you are using the free tier of the platform (generic competitions hosted on CPU).
-
 To create a competition, click [here](https://huggingface.co/spaces/competitions/create).
 
 ### Competition creator