DOC: Proper alignment of column names #40355
- [x] closes #40355
- [ ] tests added / passed
- [ ] Ensure all linting tests pass, see [here](https://pandas.pydata.org/pandas-docs/dev/development/contributing.html#code-standards) for how to run them
- [ ] whatsnew entry

Before and after

![image](https://user-images.githubusercontent.com/37313715/110698494-57f90a00-81b3-11eb-95fe-38146c50fd13.png)
 thanks @mschmookler 