The "vmdk" image has essentially changed to "wic.vmdk". I updated
the description by replacing "vmdk" with "wic.vmdk".
(From yocto-docs rev: 24d0d9509361afe0d61449c7dd056f73318fc01a)
Signed-off-by: Scott Rifenbark <srifenbark@gmail.com>
Signed-off-by: Richard Purdie <richard.purdie@linuxfoundation.org>