stable/presentation-time: swap two paragraphs in 'presented'

Associates better with the surrounding paragraphs by not jumping topics
back and forth.

Suggested-by: Bill Spitzak <spitzak@gmail.com>
Signed-off-by: Pekka Paalanen <pekka.paalanen@collabora.co.uk>
Reviewed-by: Bryce Harrington <bryce@osg.samsung.com>