Properties/Behaviour dialog should make clear settings may be overridden by .editorconfig

### What Happened?

In the Properties/Behaviour dialog the tab width was changed but this had no effect on the document being edited. This was because this dialog changes the fallback global app setting but this may be overridden by settings in `.editorconfig`.

This behaviour might confuse a new user.

### Steps to Reproduce

1. Open a project where the `.editorconfig` has a global tab width setting (e.g. Files)
2. Open a document with tabs
3. Change the global app tab setting via AppMenu/Properties/Behaviour/Tabs
4. The document is unaffected both with respect to existing and new content.
5.

### Expected Behavior

The dialog should make it clearer what the settings actually change. Ideally the dialog should allow display and modification of the `editorconfig` settings as well.

### OS Version

7.x (Early Access)

### Software Version

Latest release (I have run all updates)

### Log Output

_No response_

### Hardware Info

_No response_