Update Swagger definitions for USER based APIs with {user-id} related endpoints.

[ayshsandu]

Once these set of endpoints are enabled, need to update the following documents in https://github.com/wso2/docs-is/tree/master/en/docs/develop/restapis accordingly.

• approvals.yaml
• association.yaml
• authorizedapps.yaml
• challenge.yaml
• fido.yaml
• session.yaml
• totp.yaml
• workflow-engine.yaml