As someone who has done a lot of hiring, I've observed a strong correlation between spelling/grammar and the best programmers I've worked with. Details matter, and by failing to even read over your own submission you're showing you don't care about such details. Your commit messages and code isn't likely to impress anyone either.

Being able to write really well can also make you stand out and do wonders for your career, especially if everyone else on the team is likewise a high performer (Jeff Dean style). The best people I've worked with have also all been really nice and kind to a fault.