Document the APIML delegated.passticket functionality

[Joe-Winchester]

Document the functionality in zowe/api-layer#4368

[Joe-Winchester]

Make sure to document that this API body is using applId whereas other parts of APIML use applicationName

{
	"applId": "IZUDFLT",
	"emailId": "user@acme.com"
}

[Joe-Winchester]

Make sure the is a description of the API
zowe/api-layer#4368 (comment)