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[#6953] add versionadded directive

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Original file line number	Diff line number	Diff line change
`@@ -1,6 +1,9 @@`
`1`	`1`	`Prevent Multiple Executions of a Console Command`
`2`	`2`	`================================================`
`3`	`3`
	`4`	`+..versionadded::3.2`
	`5`	+ The ``LockableTrait`` was introduced in Symfony 3.2.
	`6`	`+`
`4`	`7`	`A simple but effective way to prevent multiple executions of the same command in`
`5`	`8`	`a single server is to use file locks. The Filesystem component provides a`
`6`	`9`	:doc:`LockHandler</components/filesystem/lock_handler>` class that eases the

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