anchor.diff:  This should be set to the project's root directory.
   
   -a, --attribute "name[=value], ..."::
  -Sets http://asciidoctor.org/docs/user-manual/#attributes[document attributes^] that will be expanded in javadoc comments.
  +Sets http://asciidoctor.org/docs/user-manual/#attributes[document attributes^] that will be expanded in Javadoc comments.
   The argument is a string containing a single attribute, or multiple attributes separated by commas.
   +
   This option may be used more than once, for example: `-a name=foo -a version=1`.
  
positive.code:             "title-link=http://example.com[${project.name} ${project.version}]")
  }
  ----
  <1> Option names passed to Gradle's javadoc task must omit the leading "-", so here "-base-dir" means "--base-dir".
      See <<doclet-options>> below.
  <2> Gradle's javadoc task does not allow multiple occurrences of the same option.
      Multiple attributes can be specified in a single string, separated by commas.
  
  === Ant
  // Some of us still use Ant, alright?!
  
negative.code: 
  --gem-path <path>::
  Sets the `GEM_PATH` for Asciidoctor's JRuby runtime.
  This option is only needed when using the `--require` option to load additional gems on the `GEM_PATH`.
  
  -overview <file>::
  Overview documentation can be generated from an Asciidoc file using the standard `-overview` option.
  