feat: add generate api token url

Author: prafull-opensignlabs

docs/docs/API-docs/opensign.yaml

@@ -2,9 +2,11 @@ openapi: 3.0.3
 info:
   title: OpenSign API v1
   description: "Welcome to the OpenSign™ API documentation! Our powerful and flexible API allows you to seamlessly integrate digital signing capabilities into your applications. Whether you're a developer looking to automate document workflows, a business seeking to enhance security, or an enterprise aiming for efficient contract management, our API provides robust solutions to meet your needs. Dive into our detailed guides, code examples, and best practices to start leveraging the full potential of OpenSign™ and transform your digital document processes today. \n\nSome useful links:\n- [OpenSign Website](https://www.opensignlabs.com)\n- [OpenSign Github repo](https://github.com/opensignlabs/opensign)"
-  termsOfService: http://www.opensignlabs.com/terms/
+  x-api-token: 
+    description: "refer docs to generate api token [APIToken help](https://docs.opensignlabs.com/docs/help/Settings/APIToken)"
   contact:
     email: api@opensignlabs.com
+  termsOfService: http://www.opensignlabs.com/terms/
   license:
     name: AGPL v 3.0
     url: http://github.com/opensignlabs/opensign/LICENSE