[docs] Incorrect React useState Example on Toggle Button

[barrownicholas]

Related page

https://mui.com/material-ui/react-toggle-button/

Kind of issue

Other

Issue description

On this example, the method of updating selected is incorrect and will cause rendering issues; it should be:

onChange={() => setSelected(selected => !selected)}

As opposed to:

onChange={() => setSelected(!selected)}

Opening this issue, and then I'll create a PR to fix it.

Here's the PR: #43987

Context

No response

Search keywords: toggle button

[barrownicholas]

Here's the PR: #43987

[github-actions]

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