[drupal-docs] question about DocBook export in admin/help for book pages

[Charlie Lowe]

The admin/help pages for books (http://drupal.org/handbook/modules/book) 
contains a paragraph describing a DocBook export option:

"They can choose to export the page and its subsections as DocBook XML 
(for offline editing, or production of print or other electronic 
publication formats), or as an outline (titles only), by selecting the 
"export DocBook XML" and "export OPML" links respectively. DocBook 
export currently treats node content as preformatted text."

Has this already been patched against Drupal core as an update for 4.6x? 
If not, it doesn't seem a good idea to provide documentation for a 
feature that does not yet definitely exist in Drupal.