fix: update pagination parameters in subscriptions controller

- Added example values for 'start' and 'size' query parameters in the getAllSubscriptions endpoint.
- Updated descriptions for better clarity in API documentation.

Author: kastov

src/modules/subscription/controllers/subscriptions.controller.ts

@@ -49,13 +49,15 @@ export class SubscriptionsController {
         name: 'start',
         type: 'number',
         required: false,
-        description: 'Offset for pagination',
+        example: 0,
+        description: GetAllSubscriptionsCommand.RequestQuerySchema.shape.start.description,
     })
     @ApiQuery({
         name: 'size',
         type: 'number',
         required: false,
-        description: 'Page size for pagination',
+        example: 25,
+        description: GetAllSubscriptionsCommand.RequestQuerySchema.shape.size.description,
     })
     @Endpoint({
         command: GetAllSubscriptionsCommand,