[core] Convert remaining classNames usage #14506
Merged
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Followup on #14152
Mostly changes in our docs. There was only once instance that could cause a bug mentioned in #14152 (comment): https://github.com/mui-org/material-ui/pull/14506/files#diff-b66f193a8970d7d9137168c42efe78c8