Update binary_search.md

Edited number out of bound topic
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@ -328,7 +328,10 @@ $$
=== "Go" === "Go"
```go title="" ```go title=""
// (i + j) 有可能超出 int 的取值范围
m := (i + j) / 2
// 更换为此写法则不会越界
m := i + (j - i) / 2
``` ```
=== "JavaScript" === "JavaScript"