修正 Java 10 中的 Optional 增强描述 #2691
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Java8 中 Optional 已经包含 orElseThrow(Supplier) 方法，但没有无参的 orElseThrow()，到 Java 10 引入了无参的 orElseThrow() 方法。并非原文所述 orElseThrow() 方法是 Java 10 才出现的。
参考：https://github.com/openjdk/jdk/blob/jdk-10%2B46/src/java.base/share/classes/java/util/Optional.java#L369