Commitd3346d8

James Halsall

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Update ProgressBar docs with regress information

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Original file line number	Diff line number	Diff line change
`@@ -35,6 +35,12 @@ number of units, and advance the progress as the command executes::`
`35`	`35`	`// ensure that the progress bar is at 100%`
`36`	`36`	`$progress->finish();`
`37`	`37`
	`38`	`+..tip::`
	`39`	`+`
	`40`	`+ You can also regress the progress bar (i.e. step backwards) by calling`
	`41`	+ ``$progress->advance()`` with a negative value. For example, if you call
	`42`	+ ``$progress->advance(-2)`` then it will regress the progress bar 2 steps.
	`43`	`+`
`38`	`44`	`Instead of advancing the bar by a number of steps (with the`
`39`	`45`	:method:`Symfony\\Component\\Console\\Helper\\ProgressBar::advance` method),
`40`	`46`	`you can also set the current progress by calling the`

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