fixes

Author: mongoKart

source/fundamentals/serialization/guid-serialization.txt

@@ -155,10 +155,10 @@ in your application, such as during the bootstrapping phase:
 
 .. tip::
 
-   When you're working with two subtypes, you can combine a global serializer with the 
-   ``BsonGuidRepresentation`` property attribute. For example, you can register a global
-   serializer for the most commonly used GUID subtype, then use the ``BsonGuidRepresentation``
-   attribute to denote any GUID properties of another subtype.  
+   When you're working with two ``BsonBinaryData`` subtypes, you can combine a global
+   serializer with the  ``BsonGuidRepresentation`` property attribute. For example, you
+   can register a global serializer for the most commonly used GUID subtype, then use
+   the ``BsonGuidRepresentation`` attribute to denote any GUID properties of another subtype.  
 
 .. important::
 

source/upgrade.txt

@@ -85,11 +85,9 @@ Version 3.0 Potential Breaking Change
     objects of subtype 4. If the object has any other subtype, you must call the
     ``BsonBinaryData.ToGuid(GuidRepresentation)`` method and specify the subtype. 
 
-  .. note::
-
-     The preceding changes affect your application only if you serialize and deserialize
-     BSON documents directly. If you map your MongoDB documents only to :ref:`csharp-poco`,
-     the ``GuidRepresentationMode`` doesn't affect your application.
+  The preceding changes affect your application only if you serialize and deserialize
+  BSON documents directly. If you map your MongoDB documents only to :ref:`csharp-poco`,
+  the ``GuidRepresentationMode`` doesn't affect your application.
 
 .. _csharp-breaking-changes-2.28.0: