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Merge pull request #2146 from Ruslan-Aleev/patch-1

Changed "position" to "index" for slice() method

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Original file line number	Diff line number	Diff line change
`@@ -712,7 +712,7 @@ A cheat sheet of array methods:`
`712`	`712`	- `shift()` -- extracts an item from the beginning,
`713`	`713`	- `unshift(...items)` -- adds items to the beginning.
`714`	`714`	- `splice(pos, deleteCount, ...items)` -- at index `pos` delete `deleteCount` elements and insert `items`.
`715`		- - `slice(start, end)` -- creates a new array, copies elements from position `start` till `end` (not inclusive) into it.
	`715`	+ - `slice(start, end)` -- creates a new array, copies elements from index `start` till `end` (not inclusive) into it.
`716`	`716`	- `concat(...items)` -- returns a new array: copies all members of the current one and adds `items` to it. If any of `items` is an array, then its elements are taken.
`717`	`717`
`718`	`718`	`- To search among elements:`

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