DOC: '10 minutes to pandas' - <TAB> completion section now show a con…
…sistent block of suggestions. Solve issue #31526

- [x] closes #31526
- [ ] tests added / passed
- [ ] passes `black pandas`
- [ ] passes `git diff upstream/master -u -- "*.py" | flake8 --diff`
- [ ] whatsnew entry

I didn't run those listed tests above, however I doubt it will break something.

This PR only correct a *Typo* I found on documentation. I hope I'll be useful to improve this project.