asciidoctor translates anchors to the unsupported db5 anchor tag

[jcayouette]

Asciidoctor translates inline anchors -> docbook 5 anchor. anchor is not supported or used. We should make this instead an xml:id in the parent tag.

Anchors in asciidoc are "translated" to in XML, instead it should better be an xml:id in the parent tag

For an example see https://w3.suse.de/~fs/doku/asciidoc/test/adoc/asciidoc.adoc and search for "http://www.xmlsoft.org[xsltproc]::"

[fsundermeyer]

Example:

  [[anchor]]foo::
    bar

Is converted to

  <variablelist>
   <varlistentry>
    <term><anchor xml:id="anchor"/>foo</term>
    <listitem><para>bar</para></listitem>
   </varlistentry>
  </variablelist>

Desired output would be

  <variablelist>
   <varlistentry xml:id="anchor">
    <term>foo</term>
    <listitem><para>bar</para></listitem>
   </varlistentry>
  </variablelist>