[#47] fixed some doc and code inconsistencies and removed some redundant parentheses

tools/list/list.go

@@ -10,7 +10,7 @@ import (
 
 var cachedPatterns = map[string]*regexp.Regexp{}
 
-// ExustInSlice checks whether a comparable element exists in a slice of the same type.
+// ExistInSlice checks whether a comparable element exists in a slice of the same type.
 func ExistInSlice[T comparable](item T, list []T) bool {
 	if len(list) == 0 {
 		return false