fix inner type generate error (#377)

* fix point type bug

* optimized

* fix inner type error

tools/goctl/api/spec/spec.go

@@ -61,6 +61,7 @@ type (
 		ResponseType Type
 		Docs         Doc
 		Handler      string
+		AtDoc        AtDoc
 	}
 
 	Service struct {
@@ -109,4 +110,9 @@ type (
 		RawName string
 		Type    Type
 	}
+
+	AtDoc struct {
+		Properties map[string]string
+		Text       string
+	}
 )