Fixed naming error on ModelSerializer relationships

Author: jerel

rest_framework_json_api/renderers.py

@@ -211,7 +211,7 @@ def extract_relationships(fields, resource, resource_instance):
 
             if isinstance(field, ModelSerializer):
                 relation_model = field.Meta.model
-                relation_type = utils.format_type(relation_model.__name__)
+                relation_type = utils.format_resource_type(relation_model.__name__)
 
                 data.update({
                     field_name: {