DOCSP-28753-backport.v4.4 fix link (#3266)

* DOCSP-28753-backport.v4.4 conflict

* DOCSP-28753-backport.v4.4 fix link for v4.4

Author: jocelyn-mendez1

source/reference/method/db.auth.txt

@@ -137,18 +137,16 @@ The :method:`db.auth()` has the following syntax forms:
 
      - string
 
-     - Optional. The :ref:`authentication mechanism
-       <mongo-shell-authentication-mechanisms>` to use.
+     - Optional. The :option:`authentication mechanism <mongo --authenticationMechanism>`
+       to use.
 
-       For available mechanisms, see :ref:`authentication mechanisms
-       <mongo-shell-authentication-mechanisms>`.
+       For available mechanisms, see :option:`authentication mechanisms <mongo --authenticationMechanism>`.
 
        If unspecified, uses the :dbcommand:`hello` command to determine
        the SASL mechanism or mechanisms for the specified user. See
        :data:`~hello.saslSupportedMechs`.
 
 
-
    * - ``digestPassword``
 
      - boolean