Add docs for `advertised.listeners` with docker examples

### Search before asking

- [x] I searched in the [issues](https://github.com/alibaba/fluss/issues) and found nothing similar.

### Description

We added the feature of `advertised.listeners` in #531, but didn't add a dedicated page/section to introduce this. This config is quite useful for docker environment (fluss in docker, while access fluss outside from docker).

### Willingness to contribute

- [ ] I'm willing to submit a PR!

Start by reading the advertised.listeners feature from issue #531 and the repository's existing configuration documentation. Add a dedicated page or section with Docker examples for accessing Fluss outside the container; done when the setting and this Docker use case are clearly explained.

Written by the indexing model from the issue text.