Fix typo in GUID to BSON mapping (#412)

Author: jordan-smith721

source/upgrade/v3.txt

@@ -118,7 +118,7 @@ Version 3.0 Breaking Changes
     objects of subtype 4. If the object has any other subtype, you must call the
     ``BsonBinaryData.ToGuid(GuidRepresentation)`` method and specify the subtype.
   - GUID conversion by using the ``BsonTypeMapper`` class has been removed. To
-    convert ``GUID`` values to BSON, use the ``BsonBindaryData(<GUID>,
+    convert ``GUID`` values to BSON, use the ``BsonBinaryData(<GUID>,
     GuidRepresentation.Standard)`` constructor.
 
   The preceding changes affect your application only if you serialize and deserialize