rnndb/timer: document MMIO_FAULT error reporting
rnndb/timer: document MMIO_FAULT error reporting

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