DOCSP-29541: newclient and connect deprecation notice (#258)

* DOCSP-29541: newclient and connect deprecation notice

* MW pr suggestions

Author: rustagir

source/whats-new.txt

@@ -20,6 +20,7 @@ What's New
 
 Learn what's new in:
 
+* :ref:`Version 1.12 <version-1.12>`
 * :ref:`Version 1.11 <version-1.11>`
 * :ref:`Version 1.10 <version-1.10>`
 * :ref:`Version 1.9 <version-1.9>`
@@ -33,11 +34,22 @@ Learn what's new in:
 * :ref:`Version 1.1 <version-1.1>`
 * :ref:`Version 1.0 <version-1.0>`
 
+.. _version-1.12:
+
+What's New in 1.12
+------------------
+
+.. important:: Deprecation Notice
+
+   - The ``mongo.NewClient()`` and ``client.Connect()`` methods are
+     deprecated. You can create a client and connect in one call
+     by using the ``mongo.Connect()`` method.
+
 .. _version-1.11.0:
 .. _version-1.11:
 
 What's New in 1.11
---------------------
+------------------
 
 .. important:: Upgrade to Version 1.11.3 or Higher
 
@@ -90,7 +102,7 @@ New features of the 1.11 Go driver release include:
 .. _version-1.10:
 
 What's New in 1.10
---------------------
+------------------
 
 .. important:: Upgrade to Version 1.10.1 or Higher 
 
@@ -141,7 +153,7 @@ New features of the 1.10 Go driver release include:
 .. _version-1.9:
 
 What's New in 1.9
--------------------
+-----------------
 
 New features of the 1.9 Go driver release include: