docs-bug(COMPONENT): What does it mean when system token is `None` in overrides (styling tab)

[kai1992cool]

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It is a bit ambiguouns when None is mentioned for system token, I cannot find any documentation explaining what None means, does it mean its not used, being developed or I need to style it myself, can this be documented?

Affected documentation page

https://material.angular.dev/components/form-field/styling