[docs] The expand / collapse icons in the default theme explorer tree view are reversed

[mmhex]

Related page

https://mui.com/material-ui/customization/default-theme/

Kind of issue

Broken demo

Issue description

The tree view toggle buttons appear expanded when collapsed and collapsed when expanded.

Context

No response

Search keywords: theme viewer, expand, collapse, toggle, default theme, theme, tree view

[DiegoAndai]

They're reversed, indeed. It's also inconsistent with https://mui.com/x/react-tree-view/?srsltid=AfmBOoo6mVrGmMkIG5229oUtTX7-lvYL195yZEhPiTdVGp643DYZTuXB.

[zanivan]

Thanks for the keen eye @mmhex ! Just opened a PR to fix it in #44989

[github-actions]

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