chore: Group documentation of x-traitTag extension (Redocly#802)

docs/redoc-vendor-extensions.md

@@ -134,13 +134,6 @@ Extends OpenAPI [Tag Object](http://swagger.io/specification/#tagObject)
 | :------------- | :------: | :---------- |
 | x-traitTag     | boolean  | In Swagger two operations can have multiple tags. This property distinguishes between tags that are used to group operations (default) from tags that are used to mark operation with certain trait (`true` value) |
 
-#### x-displayName
-
-| Field Name     |	Type	  | Description |
-| :------------- | :------: | :---------- |
-| x-displayName  | string   | Defines the text that is used for this tag in the menu and in section headings |
-
-
 ###### Usage in Redoc
 Tags that have `x-traitTag` set to `true` are listed in side-menu but don't have any subitems (operations). Tag `description` is rendered as well.
 This is useful for handling out common things like Pagination, Rate-Limits, etc.
@@ -161,6 +154,12 @@ description: Pagination description (can use markdown syntax)
 x-traitTag: true
 ```
 
+#### x-displayName
+
+| Field Name     |	Type	  | Description |
+| :------------- | :------: | :---------- |
+| x-displayName  | string   | Defines the text that is used for this tag in the menu and in section headings |
+
 ### Operation Object vendor extensions
 Extends OpenAPI [Operation Object](http://swagger.io/specification/#operationObject)
 #### x-code-samples