chore(docs): Updated API Reference (v2) (#9437)

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/apps/api-reference/specs/admin/paths/admin_customer-groups.yaml

@@ -32,6 +32,8 @@ get:
           if a field is prefixed with `+` it will be added to the default
           fields, using `-` will remove it from the default fields. without
           prefix it will replace the entire default fields.
+        externalDocs:
+          url: '#select-fields-and-relations'
     - name: offset
       in: query
       description: The number of items to skip when retrieving a list.
@@ -40,6 +42,8 @@ get:
         type: number
         title: offset
         description: The number of items to skip when retrieving a list.
+        externalDocs:
+          url: '#pagination'
     - name: limit
       in: query
       description: Limit the number of items returned in the list.
@@ -48,6 +52,8 @@ get:
         type: number
         title: limit
         description: Limit the number of items returned in the list.
+        externalDocs:
+          url: '#pagination'
     - name: order
       in: query
       description: >-
@@ -984,7 +990,7 @@ get:
           schema:
             allOf:
               - type: object
-                description: SUMMARY
+                description: The paginated list of customer groups.
                 required:
                   - limit
                   - offset
@@ -993,23 +999,25 @@ get:
                   limit:
                     type: number
                     title: limit
-                    description: The customer group's limit.
+                    description: The maximum number of items retrieved.
                   offset:
                     type: number
                     title: offset
-                    description: The customer group's offset.
+                    description: >-
+                      The number of items skipped before retrieving the returned
+                      items.
                   count:
                     type: number
                     title: count
-                    description: The customer group's count.
+                    description: The total number of items
               - type: object
-                description: SUMMARY
+                description: The paginated list of customer groups.
                 required:
                   - customer_groups
                 properties:
                   customer_groups:
                     type: array
-                    description: The customer group's customer groups.
+                    description: The list of customer groups.
                     items:
                       $ref: ../components/schemas/AdminCustomerGroup.yaml
     '400':
@@ -1056,6 +1064,8 @@ post:
           if a field is prefixed with `+` it will be added to the default
           fields, using `-` will remove it from the default fields. without
           prefix it will replace the entire default fields.
+        externalDocs:
+          url: '#select-fields-and-relations'
   security:
     - api_token: []
     - cookie_auth: []