chore(docs): Updated API Reference (#6041)

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

Co-authored-by: Oli Juhl <59018053+olivermrbl@users.noreply.github.com>
Co-authored-by: Shahed Nasser <27354907+shahednasser@users.noreply.github.com>

www/apps/api-reference/specs/admin/components/schemas/Cart.yaml

@@ -234,3 +234,10 @@ properties:
     description: The total of gift cards with taxes
     type: integer
     example: 0
+  sales_channels:
+    description: The associated sales channels.
+    type: array
+    nullable: true
+    x-expandable: sales_channels
+    items:
+      $ref: ./SalesChannel.yaml

www/apps/api-reference/specs/admin/components/schemas/Order.yaml

@@ -339,3 +339,11 @@ properties:
       description: Learn about the metadata attribute, and how to delete and update it.
       url: >-
         https://docs.medusajs.com/development/entities/overview#metadata-attribute
+  sales_channels:
+    description: The associated sales channels.
+    type: array
+    nullable: true
+    x-expandable: sales_channels
+    x-featureFlag: medusa_v2
+    items:
+      $ref: ./SalesChannel.yaml

www/apps/api-reference/specs/admin/components/schemas/PublishableApiKeySalesChannel.yaml

@@ -6,7 +6,14 @@ type: object
 required:
   - publishable_key_id
   - sales_channel_id
+  - created_at
+  - updated_at
+  - deleted_at
 properties:
+  id:
+    description: The relation's ID
+    type: string
+    example: pksc_01G8X9A7ESKAJXG2H0E6F1MW7A
   sales_channel_id:
     description: The sales channel's ID
     type: string
@@ -15,3 +22,16 @@ properties:
     description: The publishable API key's ID
     type: string
     example: pak_01G1G5V21KADXNGH29BJMAJ4B4
+  created_at:
+    description: The date with timezone at which the resource was created.
+    type: string
+    format: date-time
+  updated_at:
+    description: The date with timezone at which the resource was updated.
+    type: string
+    format: date-time
+  deleted_at:
+    description: The date with timezone at which the resource was deleted.
+    nullable: true
+    type: string
+    format: date-time

www/apps/api-reference/specs/admin/components/schemas/SalesChannel.yaml

@@ -59,3 +59,26 @@ properties:
       description: Learn about the metadata attribute, and how to delete and update it.
       url: >-
         https://docs.medusajs.com/development/entities/overview#metadata-attribute
+  carts:
+    description: The associated carts.
+    type: array
+    nullable: true
+    x-expandable: carts
+    x-featureFlag: medusa_v2
+    items:
+      type: object
+  orders:
+    description: The associated orders.
+    type: array
+    nullable: true
+    x-expandable: orders
+    x-featureFlag: medusa_v2
+    items:
+      type: object
+  publishableKeys:
+    description: The associated publishable API keys.
+    type: array
+    nullable: true
+    x-expandable: publishableKeys
+    items:
+      type: object