[docs][Rating] Added info about workaround for testing

[p-pych]

Closes: 38828

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

[mui-bot]

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[DiegoAndai]

I agree with https://github.com/mui/material-ui/issues/38828#issuecomment-2417370628 and with @ZeeshanTamboli. Closing as not planned.

@p-pych, thanks for contributing, and sorry that this PR didn't get merged. If you wish to continue to work on this issue, that would be great! Please read https://github.com/mui/material-ui/issues/38828#issuecomment-2417370628 for next steps and let us know.