DOC: Add punctuation to IntervalArray docstrings
- [ ] xref #27979
- [ ] tests added / passed
- [ ] passes `black pandas`
- [ ] passes `git diff upstream/master -u -- "*.py" | flake8 --diff`
- [ ] whatsnew entry

Added missing period to IntervalArray docstrings as suggested by @datapythonista for the following attributes and parameters:
```
pandas.arrays.IntervalArray.left
pandas.arrays.IntervalArray.right
pandas.arrays.IntervalArray.closed
pandas.arrays.IntervalArray.mid
pandas.arrays.IntervalArray.length
pandas.arrays.IntervalArray.is_non_overlapping_monotonic
pandas.arrays.IntervalArray.from_tuples
pandas.arrays.IntervalArray.set_closed
pandas.arrays.IntervalArray.to_tuples
```
This was my fault. I did not switch branches. Let me know if I need to fix this again. (failure is unrelated)