let's versus lets

let's = "let us"
lets = "allows

I included another fix (removing "provides") in the same pull request, since I'm assuming you'll want both changes—if I'm wrong and you want one but not the other I can separate them.  It looks like the "provides" was accidentally left over from a previous edit.  (For instance, I'm guessing it used to say something like "Node Webkit provides a Webkit shell on the desktop" or something like that.)