Fix typo in tz_convert docs (#47131)
Fix typo in tz_convert docs (#47131)

add klass doc decorations to tz_convert and tz_localize
pandas-dev/pandas,pandas-dev/pandas,datapythonista/pandas,datapythonista/pandas,datapythonista/pandas,pandas-dev/pandas,datapythonista/pandas,pandas-dev/pandas