add proper unordered list bullets symbols
add proper unordered list bullets symbols

getreu/asciidoctor-fopub,asciidoctor/asciidoctor-fopub,asciidoctor/asciidoctor-fopub,azuwis/asciidoctor-fopdf,getreu/asciidoctor-fopub,getreu/asciidoctor-fopub,asciidoctor/asciidoctor-fopub,azuwis/asciidoctor-fopdf