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Merge pull request #2383 from TedLau/patch-3

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Update distributed-lock-implementations.md
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docs/distributed-system/distributed-lock-implementations.md
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@ -56,7 +56,7 @@ OK
```
- **lockKey**：加锁的锁名；
- **uniqueValue**：能够唯一标示锁的随机字符串；
- **uniqueValue**：能够唯一标识锁的随机字符串；
- **NX**：只有当 lockKey 对应的 key 值不存在的时候才能 SET 成功；
- **EX**：过期时间设置（秒为单位）EX 3 标示这个锁有一个 3 秒的自动过期时间。与 EX 对应的是 PX（毫秒为单位），这两个都是过期时间设置。