enforce no use of header class in header table cell
enforce no use of header class in header table cell

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