QDoc now has support for Doxygen style commands for italics, bold
and list items. This change applies that change in QDoc to the
actual documentation.

Task-number: QTBUG-24578
Change-Id: I453169a7222ee741f8d9a10b6c063be5d15f1b76
Reviewed-by: Honglei Zhang <honglei.zhang@nokia.com>