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Merge pull request #1756 from chang-kun/patch-1

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Update tryAcquireShared Returns
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docs/java/concurrent/aqs.md
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@ -209,7 +209,7 @@ final boolean nonfairTryAcquire(int acquires) {
```java
protected boolean tryAcquire(int)//独占方式。尝试获取资源，成功则返回true，失败则返回false。
protected boolean tryRelease(int)//独占方式。尝试释放资源，成功则返回true，失败则返回false。
protected boolean tryAcquireShared(int)//共享方式。尝试获取资源。负数表示失败；0表示成功，但没有剩余可用资源；正数表示成功，且有剩余资源。
protected int tryAcquireShared(int)//共享方式。尝试获取资源。负数表示失败；0表示成功，但没有剩余可用资源；正数表示成功，且有剩余资源。
protected boolean tryReleaseShared(int)//共享方式。尝试释放资源，成功则返回true，失败则返回false。
protected boolean isHeldExclusively()//该线程是否正在独占资源。只有用到condition才需要去实现它。
```