Added documentation to customize swagger-ui endpoint
Added documentation to customize swagger-ui endpoint

fixes #1080

thomsonreuters/springfox,yelhouti/springfox,thomsonreuters/springfox,springfox/springfox,namkee/springfox,springfox/springfox,yelhouti/springfox,yelhouti/springfox,thomsonreuters/springfox,springfox/springfox,springfox/springfox,namkee/springfox,namkee/springfox