reword doc

Co-authored-by: Eric Eastwood <madlittlemods@gmail.com>

docs/admin_api/user_admin_api.md

@@ -1366,7 +1366,7 @@ _Added in Synapse 1.72.0._
 ## Redact all the events of a user
 
 This endpoint allows an admin to redact the events of a given user. There are no restrictions on redactions for a 
-local user. Redactions for non-local users are issued using the admin user, and will fail in rooms where the admin user is not admin/does not have the specified power level to issue redactions. 
+local user. By default, we puppet the user who sent the message to redact it themselves. Redactions for non-local users are issued using the admin user, and will fail in rooms where the admin user is not admin/does not have the specified power level to issue redactions. 
 
 The API is 
 ```