update ternary operator docs with no useMemo (#38)

Author: minsoo-web

code/examples/ternary-operator.md

@@ -25,7 +25,7 @@ const status = A조건 && B조건 ? "BOTH" : 둘다아닌경우 ? "NONE" : A조
 다음과 같이 조건을 `if` 문으로 풀어서 사용하면 보다 명확하고 간단하게 조건을 드러낼 수 있어요.
 
 ```typescript
-const status = useMemo(() => {
+const status = (() => {
   if (A조건 && B조건) {
    return "BOTH";
  }
@@ -35,5 +35,5 @@ const status = useMemo(() => {
  }
 
  return "NONE";
-}, [A조건, B조건]);
+}, [A조건, B조건])();
 ```

en/code/examples/ternary-operator.md

@@ -25,7 +25,7 @@ This code uses multiple nested ternary operators, making it difficult to quickly
 You can rewrite the conditions using `if` statements, as shown below, to make the logic clearer and easier to follow.
 
 ```typescript
-const status = useMemo(() => {
+const status = (() => {
   if (ACondition && BCondition) {
    return "BOTH";
  }
@@ -35,5 +35,5 @@ const status = useMemo(() => {
  }
 
  return "NONE";
-}, [ACondition, BCondition]);
+}, [ACondition, BCondition])();
 ```