chore(oas): clean up oas (#9354)

* clean up generated oas

* fix issues in docs-util

* more fixes

* align max level

* validation fix

* add missing summaries

* fix validation

* fix exchanges route

www/utils/generated/oas-output/schemas/AdminCreateProductVariantPrice.ts

@@ -28,6 +28,13 @@
  *     description: The price's rules.
  *     example:
  *       region_id: reg_123
+ *     properties:
+ *       region_id:
+ *         type: string
+ *         title: region_id
+ *         description: The ID of a region.
+ *     required:
+ *       - region_id
  * 
 */