Docbook writer: Handle admonition titles from Markdown reader

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.

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