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doc update

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Original file line number	Diff line number	Diff line change
`@@ -188,6 +188,11 @@ We provide tests for above mentioned methods.`
`188`	`188`	```
`189`	`189`	`map.computeIfPresent(1, (k, v) -> ++v);`
`190`	`190`	```
	`191`	`+ * multimap: Map<Integer, Set<Integer>> - remove value`
	`192`	`+ from set and if set is empty - remove whole entry`
	`193`	+ ```
	`194`	`+ map.computeIfPresent(key , (key, set) -> set.remove(valueToRemove) && set.isEmpty() ? null : set);`
	`195`	+ ```
`191`	`196`	`* increase a counter or init new for new entries`
`192`	`197`	```
`193`	`198`	`map.compute(1, (k, v) -> isNull(v) ? 0 : ++v);`

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