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}
 }