A suggested rewrite and a comma

Hi Sam,

Blog post is looking really good. I have a few comments - mainly, I think it's a little bit too long now, but that's awesome because it's much easier to cut than pad out. 

I've suggested a rewrite to one paragraph in this PR - I've also made two comments on paragraphs that I didn't have time to suggest a rewrite for. 

In general though, this is really, really good. Go go go!

Anna