DOC: text in pandas.Series.dt.day refers to month instead of day
#### Location of the documentation

https://pandas.pydata.org/pandas-docs/stable/reference/api/pandas.Series.dt.day.html

#### Documentation problem

The text here is a duplicate of https://pandas.pydata.org/pandas-docs/stable/reference/api/pandas.Series.dt.month.html (`The month as January=1, December=12.`), when it should probably be something else. 