all: add some godoc synopsis comments

accounts/account_manager.go

build/update-license.go

cmd/bootnode/main.go

cmd/disasm/main.go

cmd/ethtest/main.go

cmd/evm/main.go

cmd/geth/main.go

cmd/utils/cmd.go

common/bytes.go

compression/rle/read_write.go

core/chain_manager.go

core/state/statedb.go

core/types/block.go

core/vm/vm.go

eth/backend.go

event/filter/filter.go

jsre/jsre.go

miner/miner.go

p2p/nat/nat.go

p2p/server.go