(DOCSP-35104): Clarify "Charts User" creation in Atlas Project Access Manager (#632)

* clarify charts user creation

* copy feedback

Author: davidhou17

source/includes/steps-launch-charts-saas.yaml

@@ -107,11 +107,10 @@ content: |
    .. note::
  
       When you first launch |charts| in a project, |charts-short| 
-      automatically creates new 
-      :atlas:`MongoDB users </security-add-mongodb-users>` in your 
-      |service| project to access your cluster data. 
-      The names of these users are in the format:
-      ``charts+<CLUSTER-ID>@mongodb``
+      automatically creates a new 
+      :atlas:`user </access/manage-project-access/>` named 
+      :guilabel:`Charts User` with the ``Project Charts Admin`` role 
+      in your |service| project to access your cluster data.
 
    .. tabs::