Updated table with read_fwf()
- [X] closes #27884 
- [x] tests added / passed
- [x] passes `black pandas`
- [x] passes `git diff upstream/master -u -- "*.py" | flake8 --diff`
- [ ] whatsnew entry

@TomAugspurger Can you merge?
@TomAugspurger Can you merge, or need any other step? Thanks.