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Update ArrayList源码+扩容机制分析.md

fix: typo error
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@ -894,7 +894,7 @@ public class EnsureCapacityTest {
运行结果:
```
使用ensureCapacity方法1773
使用ensureCapacity方法1773
```
通过运行结果,我们可以看出向 ArrayList 添加大量元素之前最好先使用`ensureCapacity` 方法,以减少增量重新分配的次数。