RL tech PR fixes 1

Author: rustagir

source/data-formats/serialization.txt

@@ -36,14 +36,17 @@ We recommend installing the ``bson-kotlinx`` library to support
 custom codecs that have configurations to encode defaults, nulls, and
 define class discriminators.
 
-.. TODO .. note::
-..        To learn how to use the ``Codec`` interface instead of the
-..        ``kotlinx.serialization`` library to specify custom
-..        serialization behavior, see the :ref:`kotlin-sync-codecs` guide.
-.. 
-..        You might choose to use {+language+} serialization if you
-..        are already familiar with the framework or if you prefer
-..        to use an idiomatic approach.
+.. TODO fix the link in the following note
+
+.. note::
+   
+   To learn how to use the ``Codec`` interface instead of the
+   ``kotlinx.serialization`` library to specify custom
+   serialization behavior, see the Codecs guide.
+
+   You might choose to use {+language+} serialization if you
+   are already familiar with the library or if you prefer
+   to use an idiomatic approach.
 
 Supported Types
 ~~~~~~~~~~~~~~~