[style] add/change comment

src/broker/modules/list.go

 }
 
 type valueNode struct {
-	val  []int64 // Encrypted Topic
+	val  []int64 // Encrypted value
 	next *valueNode
 	prev *valueNode
 
 	range2sub_eb []int // (sub_val >= pub_val) sub#s
 }
 
-// To delete slice Array
+// To delete element in slice Array
 func remove(ary []int, i int) []int {
 	return append(ary[:i], ary[i+1:]...)
 }
 }
 
 
-// Compare ->  To compare (topics, values) in a node
+// Compare -> To compare two encrypted arrays
 func Compare(a []int64, b []int64) int {
 	if len(a) < len(b) {
 		return 1
 	l.size++
 }
 
-
 // To add a Value node to the Value list
 func (l *valueList) addValueNode(value []int64) {
 	newValNode := &valueNode{value, nil, nil, nil, nil, nil, nil, nil, nil, nil, nil, nil}
 	}
 }
 
-// op와 같은 node내의 operator리스트에서 sub가 있다면 리턴
+// To check if sub# is in the Value node's operator list
 func (node *valueNode) findOperatorList(op string, sub int, issingle bool) int {
 	ret := -1
 	if issingle == true {