Update docs/concepts/serialization.md

Co-authored-by: Sydney Runkle <54324534+sydney-runkle@users.noreply.github.com>

docs/concepts/serialization.md

@@ -224,7 +224,8 @@ print(Model(x='test value').model_dump_json())
 #> {"x":"serialized test value"}
 ```
 
-!!! note A single serializer can also be called on all fields by passing the special value '*' to the [`@field_serializer`][pydantic.functional_serializers.field_serializer] decorator.
+!!! note 
+    A single serializer can also be called on all fields by passing the special value '*' to the [`@field_serializer`][pydantic.functional_serializers.field_serializer] decorator.
 
 
 In addition, [`PlainSerializer`][pydantic.functional_serializers.PlainSerializer] and