docs(s3): remove mention of privatebeta for SSE-C (scaleway#3953)

Author: SamyOubouaziz

storage/object/api-cli/enable-sse-c.mdx

@@ -14,10 +14,6 @@ categories:
   - object-storage
 ---
 
-<Message type="important">
-SSE-C is currently in closed beta, and cannot be enabled on Scaleway Object Storage.
-</Message>
-
 **S**erver-**S**ide **E**ncryption with **C**ustomer-provided keys (SSE-C) is an encryption method provided by Scaleway Object Storage to protect your data at rest. It allows you to supply your own encryption keys to encrypt data when it is uploaded, and to decrypt data when accessed.
 
 <Message type="note">