Docbook reader produces a `Div` with `title` class for `<title>` element within an “admonition” element. Markdown writer then turns this into a fenced div with `title` class attribute. Since fenced divs are block elements, their content is recognized as a paragraph by the Markdown reader. This is an issue for Docbook writer because it would produce an invalid DocBook document from such AST – the `<title>` element can only contain “inline” elements. Let’s handle this invalid special case separately by unwrapping the paragraph before creating the `<title>` element.