TST: Allow for multiple variables on the same line in docstring validation
Allow for multiple variables to share the same type and description in documentation. For example, `i, j, k : int` Would be three variables, i, j, and k, which are all ints.

- [ ] tests added / passed 
- [x] passes `black pandas`
- [x] passes `git diff upstream/master -u -- "*.py" | flake8 --diff`
- [ ] whatsnew entry - I'm not sure how to add this, if it needs done could I get a pointer?

> Can you add test(s) for this change? There is a test directory next to the validation script you can put those in

I put in a test for if spacing is off. Other than that, it's a little hard to test because I can't have a test with more than one wrong parameter. The validation script uses sets, so the order can change between runs. Can you not put a test in `class GoodDocStrings` that has this behavior to make sure it works? Oh, yeah. I'll do that real quick. Sorry, didn't cross my mind. Thanks @Nabel0721 !