whatsnew 1.3.0
- [x] Ensure all linting tests pass, see [here](https://pandas.pydata.org/pandas-docs/dev/development/contributing.html#code-standards) for how to run them

Minor fixups. After I get feedback here, I plan to make a PR with detailed instructions about adding to the whatsnew.

cc @attack68 - the Styler sections had a major revisions, wanted to get any feedback here.

cc @jorisvandenbossche @simonjayhawkins 