DOC: Fixed PR06 docstring errors in pandas.interval_range & pandas.util.hash_array
DOC: Fixed PR06 docstring errors in pandas.interval_range

- [ ] xref #28724 
- [ ] tests added / passed
- [ ] passes `black pandas`
- [ ] passes `git diff upstream/master -u -- "*.py" | flake8 --diff`
- [ ] whatsnew entry
