minor code style fix
minor code style fix

abatalev/asciidoctor-pdf,Hextremist/asciidoctor-pdf,asciidoctor/asciidoctor-pdf,abatalev/asciidoctor-pdf,mojavelinux/asciidoctor-pdf,hmflash/asciidoctor-pdf,dsisnero/asciidoctor-pdf,mojavelinux/asciidoctor-pdf,Hextremist/asciidoctor-pdf,dsisnero/asciidoctor-pdf,asciidoctor/asciidoctor-pdf,hmflash/asciidoctor-pdf