dns_scaleway: fix doc API Key

was: SCALEWAY_API_TOKEN
now: SCW_SECRET_KEY

dnsapi/dns_scaleway.sh

@@ -4,12 +4,17 @@ dns_scaleway_info='ScaleWay.com
 Site: ScaleWay.com
 Docs: github.com/acmesh-official/acme.sh/wiki/dnsapi2#dns_scaleway
 Options:
- SCALEWAY_API_TOKEN API Token
+SCALEWAY_API_TOKEN API Key Secret (SCW_SECRET_KEY)
 Issues: github.com/acmesh-official/acme.sh/issues/3295
 '
-
 # Scaleway API
 # https://developers.scaleway.com/en/products/domain/dns/api/
+#
+# NOTE: the API of Scaleway seems to have changed
+# While in the past it was using an API Token, managing DNS now (2025) requires
+# an API Key. API Tokens are still available, but not for managing DNS.
+# For compatibility reasons, we should probably leave the variable as
+# SCALEWAY_API_TOKEN, although it now requires the value of SCW_SECRET_KEY.
 
 ########  Public functions #####################