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Improve description about streaming maps

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Original file line number	Diff line number	Diff line change
`@@ -535,7 +535,9 @@ As you can see both code snippets are almost identical but the parallel sort is`
`535`	`535`
`536`	`536`	`## Maps`
`537`	`537`
`538`		`-As already mentioned maps don't support streams. Instead maps now support various new and useful methods for doing common tasks.`
	`538`	+As already mentioned maps do not directly support streams. There's no `stream()` method available on the `Map` interface itself, however you can create specialized streams upon the keys, values or entries of a map via `map.keySet().stream()`, `map.values().stream()` and `map.entrySet().stream()`.
	`539`	`+`
	`540`	`+Furthermore maps support various new and useful methods for doing common tasks.`
`539`	`541`
`540`	`542`	```java
`541`	`543`	`Map<Integer, String> map = new HashMap<>();`

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