`DataFrame.mad()` has been deprecated

[Charlie Chen]

mad() has been deprecated since pandas 1.5 and no longer exists in pandas 2.0, while it is still listed in the table Table 5.8: Descriptive and summary statistics.

[Wes McKinney]

Thanks! I will fix this soon on wesmckinney.com/book and in the next errata-update of the print version (sometime in the next few months).