for gh-49508 changing Doc for DataFrame.astype (#49556)
for gh-49508 changing Doc for DataFrame.astype (#49556)

* for #49508 changing Doc for DataFrame.astype

added the series in input in the doc of DataFrame.astype

* up

* up2

* up3

* up4

* up5
pandas-dev/pandas,pandas-dev/pandas,pandas-dev/pandas,pandas-dev/pandas