cmd: various golint fixes (#16700)

* cmd: various golint fixes

* cmd: update to pr change request

* cmd: update to pr change request

cmd/evm/json_logger.go

@@ -32,6 +32,8 @@ type JSONLogger struct {
 	cfg     *vm.LogConfig
 }
 
+// NewJSONLogger creates a new EVM tracer that prints execution steps as JSON objects
+// into the provided stream.
 func NewJSONLogger(cfg *vm.LogConfig, writer io.Writer) *JSONLogger {
 	return &JSONLogger{json.NewEncoder(writer), cfg}
 }

cmd/evm/staterunner.go

@@ -38,6 +38,8 @@ var stateTestCommand = cli.Command{
 	ArgsUsage: "<file>",
 }
 
+// StatetestResult contains the execution status after running a state test, any
+// error that might have occurred and a dump of the final state if requested.
 type StatetestResult struct {
 	Name  string      `json:"name"`
 	Pass  bool        `json:"pass"`