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Update JavaConcurrencyAdvancedCommonInterviewQuestions.md

单例模式实例修改,在单例方法上声明synchronized关键字是不必要的且会造成性能上的开销

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Original file line number	Diff line number	Diff line change
`@@ -73,7 +73,7 @@ public class Singleton {`
`73`	`73`	`private Singleton() {`
`74`	`74`	`}`
`75`	`75`
`76`		`- public synchronized static Singleton getUniqueInstance() {`
	`76`	`+ public static Singleton getUniqueInstance() {`
`77`	`77`	`//先判断对象是否已经实例过,没有实例化过才进入加锁代码`
`78`	`78`	`if (uniqueInstance == null) {`
`79`	`79`	`//类对象加锁`

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