fix(genapi): remove private beta notice (scaleway#3935)

Author: bene2k1

ai-data/generative-apis/api-cli/using-generative-apis.mdx

@@ -13,7 +13,6 @@ dates:
 
 ## Access
 
-- Access to this service is restricted while in beta. You can request access to the product by filling out a form on the Scaleway's [betas page](https://www.scaleway.com/en/betas/#generative-apis).
 - A valid [API key](/identity-and-access-management/iam/how-to/create-api-keys/) is needed.
 
 ## Authentication