Update sent_date example in opensign.yaml

Author: prafull-opensignlabs

docs/docs/API-docs/v1.1/opensign.yaml

@@ -4659,7 +4659,7 @@ components:
         sent_date:
           type: string
           format: string
-          example: "26/11/2025"
+          example: "11/11/2025"
         status:
           type: string
           format: string