DOCS-14395 users may not authenticate as multiple users when --apiStrict

Author: jmd-mongo

source/reference/method/db.auth.txt

@@ -219,6 +219,17 @@ prompt the user to enter their password:
    use test
    db.auth( "myTestDBUser" )
 
+Starting in MongoDB 5.0, if your connection specifies the 
+:option:`--apiStrict` option, you may not use the :method:`db.auth()` 
+method to:
+
+  - Authenticate again as the same user on the same database.
+  - Authenticate as a different user when previously authenticated 
+    on the same database.
+  - Authenticate with a new database when previously authenticated on a 
+    different database.
+
+
 Authenticate when Connecting to the Shell
 ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~