Correct wording for `buildpack new` targets flag #6083

Job	Run time
acceptance-combo (current, current, current)	1m 2s
acceptance-combo (current, current, previous)	1m 0s
acceptance-combo (current, previous, previous)	59s
acceptance-combo (previous, current, current)	53s
acceptance-combo (previous, current, previous)	59s
	4m 53s

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