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Merge pull request #2691 from x0c/x0c-patch-1

修正 Java 10 中的 Optional 增强描述

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Original file line number	Diff line number	Diff line change
`@@ -81,11 +81,11 @@ list.stream().collect(Collectors.toUnmodifiableSet());`
`81`	`81`
`82`	`82`	`## Optional 增强`
`83`	`83`
`84`		-`Optional` 新增了`orElseThrow()`方法来在没有值时抛出指定的异常。
	`84`	+`Optional` 新增了一个无参的 `orElseThrow()` 方法,作为带参数的 `orElseThrow(Supplier<? extends X> exceptionSupplier)` 的简化版本,在没有值时默认抛出一个 NoSuchElementException 异常。
`85`	`85`
`86`	`86`	```java
`87`		`-Optional.ofNullable(cache.getIfPresent(key))`
`88`		`-.orElseThrow(() ->newPrestoException(NOT_FOUND, "Missing entry found for key: "+ key));`
	`87`	`+Optional<String> optional =Optional.empty();`
	`88`	`+String result = optional.orElseThrow();`
`89`	`89`	```
`90`	`90`
`91`	`91`	`## 应用程序类数据共享(扩展 CDS 功能)`

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