DOCS-79 removing jira casses per comment from @scotthernandez

Author: Sam Kleinman

draft/core/security.txt

@@ -267,14 +267,6 @@ authentication system:
   Additionally the ``admin`` database exposes several commands and
   functionality, such as :dbcommand:`listDatabases`.
 
-- The following issues track ongoing improvements to the authorization
-  or authentication system:
-  
-  - :issue:`SERVER-3198`
-  - :issue:`SERVER-7122`
-  - :issue:`SERVER-7124`
-  - :issue:`SERVER-7115`
-
 - Once authenticated a "normal" user has full read and write access to
   a database.