chore(docs): Updated API Reference (v2) (#8609)

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_campaigns.yaml

@@ -73,6 +73,41 @@ get:
   tags:
     - Campaigns
   responses:
+    '200':
+      description: OK
+      content:
+        application/json:
+          schema:
+            allOf:
+              - type: object
+                description: SUMMARY
+                required:
+                  - limit
+                  - offset
+                  - count
+                properties:
+                  limit:
+                    type: number
+                    title: limit
+                    description: The campaign's limit.
+                  offset:
+                    type: number
+                    title: offset
+                    description: The campaign's offset.
+                  count:
+                    type: number
+                    title: count
+                    description: The campaign's count.
+              - type: object
+                description: SUMMARY
+                required:
+                  - campaigns
+                properties:
+                  campaigns:
+                    type: array
+                    description: The campaign's campaigns.
+                    items:
+                      $ref: ../components/schemas/CampaignResponse.yaml
     '400':
       $ref: ../components/responses/400_error.yaml
     '401':
@@ -154,15 +189,7 @@ post:
     content:
       application/json:
         schema:
-          type: object
           description: SUMMARY
-          required:
-            - name
-            - campaign_identifier
-            - description
-            - budget
-            - starts_at
-            - ends_at
           properties:
             name:
               type: string
@@ -228,6 +255,12 @@ post:
   tags:
     - Campaigns
   responses:
+    '200':
+      description: OK
+      content:
+        application/json:
+          schema:
+            $ref: ../components/schemas/AdminCampaignResponse.yaml
     '400':
       $ref: ../components/responses/400_error.yaml
     '401':