Fixed 2 typos

[m3ldis]

wrong directory command for MacOS and misspelled Eleanor

[palantirtech]

Thanks for your interest in palantir/alerting-detection-strategy-framework, @clhefton! Before we can accept your pull request, you need to sign our contributor license agreement - just visit https://cla.palantir.com/ and follow the instructions. Once you sign, I'll automatically update this pull request.