Small corrections.

Author: papafe

src/MongoDB.Bson/Serialization/BsonClassMapDomain.cs

@@ -147,7 +147,7 @@ public void RegisterClassMap(BsonClassMap classMap)
         {
             // note: class maps can NOT be replaced (because derived classes refer to existing instance)
             _classMaps.Add(classMap.ClassType, classMap);
-            BsonSerializer.RegisterDiscriminator(classMap.ClassType, classMap.Discriminator);
+            _serializationDomain.RegisterDiscriminator(classMap.ClassType, classMap.Discriminator);
         }
         finally
         {

src/MongoDB.Bson/Serialization/IBsonSerializationDomain.cs

@@ -59,7 +59,7 @@ public interface IBsonSerializationDomain
         /// </summary>
         IBsonSerializerRegistry SerializerRegistry { get; }
 
-                /// <summary>
+        /// <summary>
         /// Registers the discriminator for a type.
         /// </summary>
         /// <param name="type">The type.</param>