DOC: fix a small typo
an alternative fix would be "pandas provides a wide range of functions for cleaning textual data and extracting useful information from it."

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

thanks @partev 