RB small fix

Author: rustagir

source/fundamentals/serialization/guid-serialization.txt

@@ -124,7 +124,7 @@ The ``CSharpLegacy``, ``JavaLegacy``, and ``PythonLegacy`` GUID
 representations are all equivalent to ``BsonBinaryData`` subtype 3, but
 use different byte orders.
 
-.. _csharp-guid-query:
+.. _csharp-guid-legacy-construct:
 
 .. note:: Construct Legacy GUIDs
 

source/upgrade/v3.txt

@@ -114,8 +114,9 @@ Version 3.0 Breaking Changes
   - The ``BsonBinaryData(Guid)`` constructor has been removed. To
     construct a ``BsonBinaryData`` object from a GUID, use the
     ``BsonBinaryData.Create(Guid, GuidRepresentation)`` constructor. To
-    view an example, see the :ref:`Construct Legacy GUIDs
-    <csharp-guid-query>` note in the GUID Serialization guide.
+    view an example of creating a legacy GUID, see the :ref:`Construct
+    Legacy GUIDs <csharp-guid-legacy-construct>` note in the GUID
+    Serialization guide.
   - The ``BsonBinaryData.GuidRepresentation`` property has been removed.
   - You can call the ``BsonBinaryData.ToGuid()`` method only on ``BsonBinaryData``
     objects of subtype 4. If the object has any other subtype, you must call the