fix doc pom problems
fix doc pom problems

- code highlighter is an attribute for asciidoctor (https://docs.asciidoctor.org/asciidoc/latest/attributes/document-attributes-ref/#source-highlighting-and-formatting-attributes)
- scm-publish checkout directory attribute (http://maven.apache.org/plugins/maven-scm-publish-plugin/publish-scm-mojo.html#checkoutDirectory)

hgschmie/jdbi,jdbi/jdbi,hgschmie/jdbi,hgschmie/jdbi,jdbi/jdbi,jdbi/jdbi