[docs] Add additional info to v7 theme behavior changes example

[Crowley723]

Related page

https://next.mui.com/material-ui/migration/upgrade-to-v7/#theme-behavior-changes

Kind of issue

Missing information

Issue description

It shows that you can have a theme with both a light and dark version but doesn't give an example of what that looks like.

Ideally we could get an example of a theme that's created that has both light and dark mode values that can be used in the way currently shown by the first codeblock.

Context

I'm just looking for some additional info regarding how the new colorScheme attribute works.

Search keywords: docs migration theme

[aarongarciah]

Hi @Crowley723, thanks for the suggestion. This section in the v7 upgrade guide is meant to explain the ThemeProvider behavior differences in v7 when it comes to re-render itself when the color mode changes. The are no differences with v6 in terms of how to define tokens. See the existing docs (v6) to see what's the colorSchemes structure in the theme object.

[Crowley723]

Ah, I didn't realize it was an existing feature. Thanks for pointing it out to me.

[github-actions]

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