DOCSP-43182: add description to go v2 intro (#379)

* DOCSP-43182: add description to go v2 intro

* wip

source/whats-new.txt

@@ -51,6 +51,13 @@ Learn what's new in:
 What's New in 2.0
 -----------------
 
+The 2.0 {+driver-short+} release supports various new features, provides
+a smoother timeout experience, and implements clearer, more idiomatic Go
+code by streamlining APIs, improving errors descriptions, and
+simplifying the driver package structure.
+
+In this section, you can learn more about these changes.
+
 .. important:: Breaking Changes
 
    The {+driver-short+} v2.0 release introduces the following breaking
@@ -90,7 +97,7 @@ What's New in 2.0
      Learn more in the :ref:`golang-timeout-setting` section of the
      Connection Options guide.
 
-The 2.0 {+driver-short+} release includes the following improvements and fixes:
+This release includes the following improvements and fixes:
 
 - You can access the GridFS API from the ``mongo`` package. In previous
   versions, you could access GridFS functions from the separate ``gridfs``