Change default initial header level for REsT rendering.
Change default initial header level for REsT rendering.

The initial level was 1 which made DashboardAPI documentation look
odd. I changed it to 4 to make it more pleasant to look at.


OSSystems/lava-server,Linaro/lava-server,OSSystems/lava-server,Linaro/lava-server,Linaro/lava-server,OSSystems/lava-server,Linaro/lava-server