anchor.diff:  ----
   
   You can use the key that you assign to the font in the font catalog anywhere the `font-family` property is accepted in the theme file.
  -For instance, to use the Roboto font for all headings, you'd use:
  +For example, to use the Roboto font for all headings, use:
   
   [source,yaml]
   ----
  
positive.code:       bold_italic: roboto-light-bold_italic.ttf
  ----
  
  TIP: Text in SVGs will use the font catalog from your theme.
  We recommend that you match the font key to the name of the font seen by the operating system.
  This will allow you to use the same font names (aka families) in both your graphics program and Asciidoctor PDF.
  
  === Fallback Fonts
  
  
negative.code: The limited character set of WINANSI, or the bland look of the built-in fonts, may motivate you to load your own font.
  Custom fonts can enhance the look of your PDF theme substantially.
  
  To start, find the TTF file collection for the font you want to use.
  A collection typically consists of all four font styles:
  
  * normal
  * italic
  