IntervalArray not documented in What's New for 0.24.0rc1

[Dr-Irv]

Problem description

The new type IntervalArray is in the API reference, but is not mentioned in What's New in the docs for v0.24.0rc1 . The existence of the new type is probably something people would like to know about.

http://pandas.pydata.org/pandas-docs/version/0.24.0rc1/api/arrays.html#interval-data has it listed there, but in http://pandas.pydata.org/pandas-docs/version/0.24.0rc1/whatsnew/v0.24.0.html it appears in an example, and that there is a new method for the type.

Not sure if @TomAugspurger or @jschendel should look at that.

[TomAugspurger]

IMO, the most important thing is that interval data can be stored in Series, which is covered by http://pandas.pydata.org/pandas-docs/version/0.24.0rc1/whatsnew/v0.24.0.html#storing-interval-and-period-data-in-series-and-dataframe.

[jschendel]

At the very least it might be nice to reword things slightly to explicitly mention IntervalArray (and PeriodArray) and include links to the api reference in the section mentioned by @TomAugspurger above.

[TomAugspurger]

Yeah noting IntervalArray and PeriodArray in that section would be an improvement.