[core] Fix MUI Base vale rule

[oliviertassinari]

A continuation of #45060.

As a side note, there seem to be more to rename.

[mui-bot]

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[mapache-salvaje]

Somewhat tangential: should we even continue to provide the MUI Base examples at all? If so, we should probably rename those directories as well.

[oliviertassinari]

we should probably rename those directories as well

@mapache-salvaje Agree. Added as point 9 in #44910 (comment).

I imagine that there is space to create an equivalent example in /~https://github.com/mui/base-ui. For example, as far as I know, the Tailwind CSS interaction can be improved by using @utility to have shortcuts. We also need it so people can easily provide reproductions: mui/base-ui#1367.

should we even continue to provide the MUI Base examples at all?

I think we should keep them through 2025. I get that those examples are mostly used by new users but people continue to use the software after it gets deprecated. Once the download ratio between MUI Base and Base UI inverse, 💯 to at least remove 3 of the 4 examples. Added as point 10 in #44910 (comment).