docs: Fix documentation for useEmulation flag
docs: Fix documentation for useEmulation flag

developerConfiguration lives under configuration, and with the
move from ConfigMap to a custom resource it's now possible to
use actual booleans for useEmulation and friends.

Fixes: 8884226c8b8554b9af75036912badfedc1ba7509
Signed-off-by: Andrea Bolognani <3ada0bee826c753786fdbba72243dfba997094cf@redhat.com>

kubevirt/kubevirt,davidvossel/kubevirt,kubevirt/kubevirt,davidvossel/kubevirt,davidvossel/kubevirt,stu-gott/kubevirt,kubevirt/kubevirt,kubevirt/kubevirt,stu-gott/kubevirt,stu-gott/kubevirt,davidvossel/kubevirt,stu-gott/kubevirt