Update docs/chapter_searching/hashing_search.md

Co-authored-by: Justin Tse <xiefahit@gmail.com>
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```typescript title="hashing_search.ts"
/* 哈希查找(数组) */
function hashingSearch(map: Map<number, number>, target: number) {
function hashingSearch(map: Map<number, number>, target: number): number {
// 哈希表的 key: 目标元素value: 索引
// 若哈希表中无此 key ,返回 -1
return map.has(target) ? map.get(target) : -1;
return map.has(target) ? map.get(target) as number : -1;
}
```

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