Add screenshot for articles about issue fields

[rakleed]

Code of Conduct

• I have read and agree to the GitHub Docs project's Code of Conduct

What article on docs.github.com is affected?

• https://docs.github.com/en/issues/tracking-your-work-with-issues/using-issues/adding-and-managing-issue-fields
• https://docs.github.com/en/issues/tracking-your-work-with-issues/using-issues/managing-issue-fields-in-your-organization

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

I'd like to see screenshots in these articles to help convince repository owners to start using this feature. Currently, there's only a short video in the discussion (https://github.com/orgs/community/discussions/189141), and it doesn't show how it will look in the general issue list, how to configure it, and so on. I also didn't find any repositories with many issues that used fields.

Additional information

No response