add dots to all levels in TOC if toc_dot_leader_levels is all
add dots to all levels in TOC if toc_dot_leader_levels is all

- specifically, add dots to part entries

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