updated to add access function role

Author: iamfortune

modules/ROOT/pages/_partials/sync-api/sync-function-api-access.adoc

@@ -32,6 +32,9 @@ This grants access to the specified channel(s) for all users assigned that role.
 
 The effects of all access calls by all active documents are effectively combined in a union, so if _any_ document grants a user access to a channel, that user has access to the channel.
 
+The `access()` function grants access to users or roles that do not yet exist.
+When you create such users or define roles later, the previous granted access permissions automatically apply to them.
+
 NOTE: The sync function `access()` call does not support the wildcard ('***') for granting access to all channels.
 To grant a user access to all channels, use the REST API channel grant endpoint.