add note about DSL origins
add note about DSL origins

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