oas: [5/n] improve oas schemas (#9066)

Improve oas schemas [5/n]

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

@@ -14,7 +14,7 @@
  *   sku:
  *     type: string
  *     title: sku
- *     description: The inventory item's sku.
+ *     description: The inventory item's SKU.
  *   origin_country:
  *     type: string
  *     title: origin_country
@@ -22,15 +22,15 @@
  *   hs_code:
  *     type: string
  *     title: hs_code
- *     description: The inventory item's hs code.
+ *     description: The inventory item's HS code.
  *   requires_shipping:
  *     type: boolean
  *     title: requires_shipping
- *     description: The inventory item's requires shipping.
+ *     description: Whether the inventory item requires shipping.
  *   mid_code:
  *     type: string
  *     title: mid_code
- *     description: The inventory item's mid code.
+ *     description: The inventory item's MID code.
  *   material:
  *     type: string
  *     title: material
@@ -62,13 +62,13 @@
  *   thumbnail:
  *     type: string
  *     title: thumbnail
- *     description: The inventory item's thumbnail.
+ *     description: The URL of the inventory item's thumbnail.
  *   metadata:
  *     type: object
- *     description: The inventory item's metadata.
+ *     description: The inventory item's metadata, can hold custom key-value pairs.
  *   location_levels:
  *     type: array
- *     description: The inventory item's location levels.
+ *     description: The inventory item's associated inventory levels.
  *     items:
  *       $ref: "#/components/schemas/AdminInventoryLevel"
  *