chore(docs): Updated API Reference (v2) (#9033)

Automated changes by [create-pull-request](https://github.com/peter-evans/create-pull-request) GitHub action

Co-authored-by: Shahed Nasser <27354907+shahednasser@users.noreply.github.com>

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

@@ -63,6 +63,10 @@
  *     type: boolean
  *     title: manage_inventory
  *     description: The parent's manage inventory.
+ *   inventory_quantity:
+ *     type: number
+ *     title: inventory_quantity
+ *     description: The parent's inventory quantity.
  *   hs_code:
  *     type: string
  *     title: hs_code