Fix typo

Adjust one instance of "O'Rielly" to be consistent with the other, correct spelling,
"O'Reilly".

(Pardon these perhaps seemingly out of the blue pull requests to your website. I was reading your Starfish & Spider post, and found my way to the homepage, and thought I'd submit fixes to address issues I saw. Also, it's fine if you fix them yourself and push those commits, rather than have me show up in the git log.)