add pvideo register docs based on overlay impl
add pvideo register docs based on overlay impl

karolherbst/envytools,pierremoreau/envytools,hakzsam/envytools,hakzsam/envytools,kfractal/envytools,kfractal/envytools,kfractal/envytools,karolherbst/envytools,envytools/envytools,MoochMcGee/envytools,MoochMcGee/envytools,karolherbst/envytools,hakzsam/envytools,hakzsam/envytools,grate-driver/envytools,envytools/envytools,kfractal/envytools,pierremoreau/envytools,hakzsam/envytools,pierremoreau/envytools,grate-driver/envytools,MoochMcGee/envytools,karolherbst/envytools,grate-driver/envytools,MoochMcGee/envytools,MoochMcGee/envytools,grate-driver/envytools,envytools/envytools,pierremoreau/envytools,envytools/envytools,kfractal/envytools,pierremoreau/envytools,karolherbst/envytools,grate-driver/envytools,envytools/envytools