DOCSP-50021: Remove eol server mentions (#97)

(cherry picked from commit c31ce84)

Author: norareidy

source/security/authentication.txt

@@ -33,24 +33,18 @@ server to ensure security.
    :ref:`Enterprise Authentication Mechanisms guide <kotlin-sync-enterprise-auth>`.
 
 .. _kotlin-sync-auth-default:
+.. _kotlin-sync-auth-scramsha256:
 
-Default
--------
-
-The default authentication mechanism setting uses one of the following
-authentication mechanisms depending on what your MongoDB server supports:
-
-#. ``SCRAM-SHA-256``: An authentication mechanism that
-   uses your database username and password, encrypted with the ``SHA-256``
-   algorithm
-#. ``SCRAM-SHA-1``: An authentication mechanism that
-   uses your database username and password, encrypted with the ``SHA-1``
-   algorithm
+SCRAM-SHA-256
+-------------
 
-{+mdb-server+} versions 4.0 and later use ``SCRAM-SHA-256`` as the default
-authentication mechanism.
+``SCRAM-SHA-256``, as defined by `RFC 7677 <https://www.rfc-editor.org/rfc/rfc7677>`__, 
+is a Salted Challenge Response Authentication Mechanism
+(SCRAM) that uses your username and password, encrypted with the ``SHA-256``
+algorithm, to authenticate your user. This is the default authentication
+mechanism.
 
-The following code snippets show how to use the default authentication mechanism by
+The following code snippets show how to specify this default authentication mechanism by
 using the following placeholders:
 
 * ``db_username``: Your MongoDB database username.
@@ -93,34 +87,8 @@ mechanism:
          :end-before: end-default-mongo-cred
          :dedent:
 
-For more information about using SCRAM with MongoDB, see the 
-:manual:`SCRAM </core/security-scram/>` section of the {+mdb-server+} manual.
-
-.. _kotlin-sync-auth-scramsha256:
-
-SCRAM-SHA-256
--------------
-
-.. note::
-
-   ``SCRAM-SHA-256`` is the default authentication method for {+mdb-server+} 
-   versions 4.0 and later.
-
-``SCRAM-SHA-256``, as defined by `RFC 7677 <https://www.rfc-editor.org/rfc/rfc7677>`__, 
-is a Salted Challenge Response Authentication Mechanism
-(SCRAM) that uses your username and password, encrypted with the ``SHA-256``
-algorithm, to authenticate your user.
-
-The following code snippets show how to specify the authentication mechanism by
-using the following placeholders:
-
-* ``db_username``: Your MongoDB database username.
-* ``db_password``: Your MongoDB database user's password.
-* ``hostname``: The network address of your MongoDB deployment, accessible by your client.
-* ``port``: The port number of your MongoDB deployment.
-* ``authenticationDb``: The MongoDB database that contains your user's
-  authentication data. If you omit this parameter, the driver uses the
-  default value ``admin``.
+You can also explicitly specify the `SCRAM-SHA-256`` authentication mechanism,
+as shown in the following code snippets.
 
 Select the :guilabel:`Connection String` or the :guilabel:`MongoCredential`
 tab below for instructions and sample code for specifying this authentication
@@ -161,10 +129,6 @@ mechanism:
 SCRAM-SHA-1
 -----------
 
-.. note::
-   ``SCRAM-SHA-1`` is the default authentication method for MongoDB versions
-   {+mdb-server+} versions 3.6 and earlier.
-
 ``SCRAM-SHA-1``, as defined by `RFC 5802 <https://www.rfc-editor.org/rfc/rfc5802>`__, 
 is a Salted Challenge Response Authentication Mechanism (SCRAM) that uses your
 username and password, encrypted with the ``SHA-1`` algorithm, to authenticate