Missing documentation on how to use "Auth -> Inherit from parent"

### Code of Conduct

- [X] I have read and agree to the Insomnia Docs project's [Code of Conduct](https://github.com/Kong/insomnia-docs/blob/main/CODE_OF_CONDUCT.md).

### What article on docs.insomnia.rest is affected?

I see this "Inherit from parent" feature but the documentation does not tell me how to use it.


I am expecting to see some instructions here:
https://docs.insomnia.rest/insomnia/authentication

### What part(s) of the article would you like to see updated?

There should be instructions on how to use "Inherit from parent"

### Additional information

_No response_

### Code of Conduct and Community Expectations

- [X] I agree to follow this project's Code of Conduct
- [X] I agree to abide by the Community Expectations

Start with the authentication article linked in the issue and review how the “Inherit from parent” option is presented in Insomnia. Add clear instructions explaining how to use that option, then verify the article covers the requested workflow and matches the referenced UI.

Written by the indexing model from the issue text.