keycloak: clarify cloud does not use signed requests

Author: kevinpapst

collections/_documentation/cloud/cloud-saml.md

@@ -127,6 +127,8 @@ This screenshot is a showcase of the attribute mapping including groups:
 
 Start by setting up your Keycloak following the [Keycloak docs]({% link _documentation/saml-keycloak.md %}). 
 
+There is one difference though: the cloud does not activate `authnRequestsSigned`, which means you have to deactivate `Client signature required`. 
+
 Then make sure to define the `User attribute` mapping like this (**correct case is important, and you need to configure all attributes, even if you do not use them**):
 
 - `Basic Information > Primary email` → `Email`