anchor.diff:  <1> Converts all files in the `docs` folder and its subfolders.
   
   You can also load the document inside a `Document` object.
  -This object represents the whole document, including its headers.
  +This object represents the whole document, including its headings.
   You can use it to navigate through the internals of a parsed document.
   To load a document, use the `load` or `loadFile` methods.
   
  
positive.code: System.out.println(htmlBuffer.toString());
  ----
  
  ==== Safe mode and file system access
  Asciidoctor provides security levels that control the read and write access of attributes, the include directive, macros, and scripts while a document is processing. Each level includes the restrictions enabled in the prior security level.
  
  When Asciidoctor (and AsciidoctorJ) is used as _API_, it uses `SECURE` safe mode by default.
  
negative.code: 
  === DocinfoProcessor
  
  This extension inserts custom content on header or footer of the document.
  For example can be used for adding `meta` tags on `<head>` tags.
  
  [source]
  