DOCSP-45311: Remove deprecated utf8 types (#78)

* DOCSP-45311: Remove deprecated utf8 types

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source/upgrade.txt

@@ -149,6 +149,8 @@ The v4.0 driver introduces the following breaking changes to the build system:
   To include test targets in the "all" target, you must also set the
   ``BUILD_TESTING`` option to ``ON``.
 
+.. _version-4.0-api-breaking:
+
 API Breaking Changes in v4.0
 ````````````````````````````
 
@@ -159,6 +161,17 @@ The v4.0 driver introduces the following breaking changes to the API:
   library equivalents. For context, see the :ref:`Build System Breaking Changes
   <version-4.0-build-system-breaking>` section.
 
+- Removes the following deprecated ``utf8`` types and functions that have ``string`` equivalents:
+
+  - ``k_utf8`` from the ``bsoncxx::v_noabi::type`` class. Instead, use ``k_string``.
+  - ``b_utf8`` from the ``bsoncxx::v_noabi::types`` class. Instead, use ``b_string``.
+  - ``get_utf8()`` from the ``bsoncxx::v_noabi::document::element``, ``bsoncxx::v_noabi::array::element``,
+    and ``bsoncxx::v_noabi::types::bson_value::view`` classes. Instead, use ``get_string()``.
+  - ``k_cannot_append_utf8`` from the ``bsoncxx::v_noabi::exception::error_code`` class.
+    Instead, use ``k_cannot_append_string``.
+  - ``k_need_element_type_k_utf8`` from the ``bsoncxx::v_noabi::exception::error_code`` class.
+    Instead, use ``k_need_element_type_k_string``.
+
 - Removes the ``mongocxx::stdx`` namespace. Replace the following
   types in your code:
 
@@ -184,6 +197,10 @@ The v4.0 driver introduces the following breaking changes to the ABI:
   library equivalents. For context, see the :ref:`Build System Breaking Changes
   <version-4.0-build-system-breaking>` section.
 
+- Removes deprecated ``utf8`` functions that have ``string`` equivalents.
+  For a full list of these changes, see the :ref:`API Breaking Changes <version-4.0-api-breaking>`
+  section.
+
 .. _version-3.11-breaking-changes:
 
 Version 3.11