Add more examples to the NEWS/What's New docs

I think having a concise list is good, but if we want to elaborate more and clarify we could also provide some examples. An example for this is "a new feature was included in Python 3.13 alpha 1, but got removed in 3.13 beta 2, before the final release of 3.13.".

If we add examples, we could follow the ✔️ good/❌ bad format and do one or two lists with examples like:

✅ the following examples need a NEWS entry:
* a new function, method, class, module
* a new HOWTO in the documentation
* the removal of a deprecated feature
* ...

❌ the following examples *don't* need a NEWS entry:
* a new feature was included in Python 3.13 alpha 1, but got removed in 3.13 beta 2, > before the final release of 3.13
* a typo fix in the documentation or in a docstring
* the addition of a new test method
* the removal of a private and internal API
* code refactoring of a module with no user-visible effects

Originally posted by @ezio-melotti in https://github.com/python/devguide/pull/1238#discussion_r1417763167

issue で参照されている NEWS/What's New ドキュメントを見つけ、NEWS エントリを追加するタイミングについての現在の指針を確認してください。Python のリリース、ドキュメント、テスト、private API、リファクタリングについて、一覧にあるケースを含む、簡潔な良い例と悪い例を追加してください。例が明確に表示され、周囲の指針と一致していることを確認してください。