add arrow replacements, fix em replacement
add arrow replacements, fix em replacement

mjang/mj-asciidoc,gjtorikian/asciidoctor,glamouracademy/asciidoctor,neontapir/asciidoctor,benignbala/asciidoctor,cesarmarinhorj/asciidoctor,benignbala/asciidoctor,pepijnve/asciidoctor,gjtorikian/asciidoctor,yukisan/asciidoctor,mjang/mj-asciidoc,glamouracademy/asciidoctor,asciidocfx/asciidoctor,cuit-zhaxin/asciidoctor,anthonny/asciidoctor,yukisan/asciidoctor,pepijnve/asciidoctor,neontapir/asciidoctor,asciidocfx/asciidoctor,anthonny/asciidoctor,cuit-zhaxin/asciidoctor