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Update cache.rst

*Using Cache Tags* section has invalid example. Should use TagAwareCacheInterface.

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Original file line number	Diff line number	Diff line change
`@@ -486,15 +486,15 @@ to be able to invalidate the cache more efficient. One way to achieve that is to`
`486`	`486`	`use cache tags. One or more tags could be added to the cache item. All items with`
`487`	`487`	`the same key could be invalidate with one function call::`
`488`	`488`
`489`		`- use Symfony\Contracts\Cache\ItemInterface;`
	`489`	`+ use Symfony\Contracts\Cache\TagAwareCacheInterface;`
`490`	`490`
`491`		`- $value0 = $pool->get('item_0', function (ItemInterface $item) {`
	`491`	`+ $value0 = $pool->get('item_0', function (TagAwareCacheInterface $item) {`
`492`	`492`	`$item->tag(['foo', 'bar'])`
`493`	`493`
`494`	`494`	`return 'debug';`
`495`	`495`	`});`
`496`	`496`
`497`		`- $value1 = $pool->get('item_1', function (ItemInterface $item) {`
	`497`	`+ $value1 = $pool->get('item_1', function (TagAwareCacheInterface $item) {`
`498`	`498`	`$item->tag('foo')`
`499`	`499`
`500`	`500`	`return 'debug';`

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