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Documented the dynamic lock refresh

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Original file line number	Diff line number	Diff line change
`@@ -143,6 +143,23 @@ to reset the TTL to its original value::`
`143`	`143`	`$lock->release();`
`144`	`144`	`}`
`145`	`145`
	`146`	`+..tip::`
	`147`	`+`
	`148`	`+ Another useful technique for long-running tasks is to pass a custom TTL as`
	`149`	+ an argument of the ``refresh()`` method to change the default lock TTL::
	`150`	`+`
	`151`	`+ $lock = $factory->createLock('charts-generation', 30);`
	`152`	`+ // ...`
	`153`	`+ // refresh the lock for 30 seconds`
	`154`	`+ $lock->refresh();`
	`155`	`+ // ...`
	`156`	`+ // refresh the lock for 600 seconds (next refresh() call will be 30 seconds again)`
	`157`	`+ $lock->refresh(600);`
	`158`	`+`
	`159`	`+ ..versionadded::4.1`
	`160`	+ The feature to pass a custom TTL as an argument of the ``refresh()``
	`161`	`+ method was introduced in Symfony 4.1.`
	`162`	`+`
`146`	`163`	`Available Stores`
`147`	`164`	`----------------`
`148`	`165`

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