Clarify what the `icon` is when none is specified

[zadjii-msft]

The default icons are useful to users who need them. For example, I use Yori(a modern CMD replacement), whose prompts can be customized like any modern shell(PowerShell, Z shell) with modern features like tab completion and can also function as a replacement of cmd. I set it to the default cmd icon ms-appx:///ProfileIcons/{0caa0dad-35be-5f56-a8ff-afceeeaa6101}.png. But in Windows 11 when I open a bat file with Windows Terminal it uses some default cmd profile to run that script and uses this icon What is this icon and where can I find it?

Ah, good eye, the docs should be updated.

If there's no icon specified, we'll fall back to this glyph from Segoe Fluent:

Glyph	Unicode point	Description
	e756	CommandPrompt

From discussion in https://github.com/microsoft/terminal/issues/1918

[mattwojo]

Note added here: https://learn.microsoft.com/en-us/windows/terminal/customize-settings/profile-appearance#icons