CLN: Fix Spelling Errors
- [X] tests added / passed
- [X] passes `git diff upstream/master -u -- "*.py" | flake8 --diff`

Fixed some miscellaneous spelling errors.  One test has been re-enabled after not running due to the prefix `tets_` being misspelled.  Not technically a spelling error, but I changed colour -> color in a few places; seems reasonable since the 'u' is omitted in most cases when color is a parameter.  Some changes were just to code comments, so not terribly useful, but makes reading comments a bit nicer.
