Update index.mdx (#3885)

Author: fpagny

observability/cockpit/index.mdx

@@ -73,7 +73,7 @@ meta:
     productLogo="cli"
     title="Cockpit API"
     description="Manage Cockpit using the Scaleway API."
-    url="https://www.scaleway.com/en/developers/api/cockpit/"
+    url="https://www.scaleway.com/en/developers/api/cockpit/regional-api/"
     label="Go to Cockpit API"
 />