On https://asciidoctor.org/docs/ there's a link to "Convert AsciiDoc to PDF with Asciidoctor" which seems to get redirected to https://asciidoctor.org/docs/asciidoctor-pdf/ which says Unresolved directive in asciidoctor-pdf.adoc - include::https://cdn.jsdelivr.net/gh/asciidoctor/asciidoctor-pdf@v1.5.4/README.adoc[]
On https://asciidoctor.org/docs/ there's a link to "Convert AsciiDoc to PDF with Asciidoctor" which seems to get redirected to https://asciidoctor.org/docs/asciidoctor-pdf/ which says
Unresolved directive in asciidoctor-pdf.adoc - include::https://cdn.jsdelivr.net/gh/asciidoctor/asciidoctor-pdf@v1.5.4/README.adoc[]