BUG: 27453 right merge order
Resurrection of #27762

I fixed the NameError in the test, and also changed the example given in the whatsnew entry (I couldn't see a difference between the outputs of 0.25.x and 1.0.0 in the original)

- [x] closes #27453
- [x] tests added / passed
- [x] passes `black pandas`
- [x] passes `git diff upstream/master -u -- "*.py" | flake8 --diff`
- [x] whatsnew entry
