[docs-infra] Fix selected tab on codeblocks

[danilo-leal]

• I have followed (at least) the PR section of the contributing guide.

Potentially the smallest PR I've ever opened 😅 Just fixing the class name of the selected tab on code blocks.

A regression from #40205

• Before: https://deploy-preview-41033--material-ui.netlify.app/experiments/docs/codeblock/
• After: https://deploy-preview-41036--material-ui.netlify.app/experiments/docs/codeblock/

[mui-bot]

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[oliviertassinari]

General note

If we could systematically reference regressions by adding the regression label on top of bug, referencing the PR who broke it, and asking for a review from the author of the regression PR, it would be great.

For instance, this is a great case to why we need https://www.notion.so/mui-org/code-infra-Website-docs-visual-regression-6fe97a982e0b4536a77292090c1c16be. This is also important for the person who did the work in the first place, gaining a stronger understanding on the true requirement to make the change happen.

Off-topic

In the file, const StyledTab = styled(Tab)< I hate this so much, but const Tab = styled(TabBase)< 😌

[danilo-leal]

@oliviertassinari That makes sense! I've seen you doing this formatting and standardization a couple of times now, and I think that for it to be adopted, we need first to document this guideline somewhere that's easier to find — PR comments can be too ephemeral. I've started adding it to the "GitHub PRs" Notion page (we can think about better places for it if needed).