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doc update

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Original file line number	Diff line number	Diff line change
`@@ -105,4 +105,15 @@ We provide tests for above mentioned methods.`
`105`	`105`	`Map<String, Integer> counter = new HashMap<>();`
`106`	`106`
`107`	`107`	`counter.putIfAbsent("11-u", 0);`
	`108`	+ ```
	`109`	`+ * we want to remove entry, but only when key is associated with`
	`110`	`+ specific value`
	`111`	+ ```
	`112`	`+ map.remove(key, value)`
	`113`	+ ```
	`114`	`+ * increase all counters`
	`115`	+ ```
	`116`	`+ Map<String, Integer> counter = new HashMap<>();`
	`117`	`+`
	`118`	`+ counter.replaceAll((k, v) -> ++v)`
`108`	`119`	```

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