DOCSP-41828 - Remove legacy package (#230)

Author: mongoKart

.github/workflows/copy-compat-to-docs-shared.yml

@@ -7,6 +7,7 @@ on:
     paths:
       - "source/includes/mongodb-compatibility-table-csharp.rst"
       - "source/includes/language-compatibility-table-csharp.rst"
+  workflow_dispatch:
 
 jobs:
   copy-file:

source/whats-new.txt

@@ -43,6 +43,13 @@ What's New in 3.0
    The v3.0 driver contains breaking changes. See :ref:`<csharp-breaking-changes-3.0>`
    for more information.
 
+The 3.0 driver release includes the following new features:
+
+- Removes the
+  `mongocsharpdriver <https://www.nuget.org/packages/mongocsharpdriver/#readme-body-tab>`__ NuGet package,
+  which implements the v1.x driver API in driver versions 2.x. This package will no
+  longer receive updates.
+
 .. _csharp-version-2.28:
 
 What's New in 2.28