[REQUEST]: add more concrete descripton to create policy with no ui page

### Description

In this issue
https://github.com/elastic/kibana/issues/159444
we raised already to add some more examples to
https://www.elastic.co/guide/en/fleet/current/create-a-policy-no-ui.html
Would it be possible to add as well guidance on how to add other integrations that are not mentioned on this page in order to illustrate the steps folks need to do using Fleet UI in order to expose the needed policy for such policies.
The documentation page doesn't outline the use case of why someone would need to create policies with no UI, which would be afaiu mainly for automation purposes.

### Resources

https://www.elastic.co/guide/en/fleet/current/create-a-policy-no-ui.html

### Collaboration

TBD. The docs and product team will work together to determine the best path forward.

### Point of contact.

**Main contact:** @jlind23

**Stakeholders:**