Should the blank line be added above '+'?  I somehow doubt it.

To be honest, this is my first time using asciidoctor, I 
sincerely don't know. Building a local pdf with
`asciidoctor-pdf` didn't change the generated PDF. But of 
course, this doesn't follow the style of the rest of the
document. I'm sorry, I'll fix it in v4.

Other than that, looking very good.

Thanks for your help in this patch!