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Remove extra parentheses in output formatting tutorial (GH-8350)

The parentheses were incorrect.
A
Aaqa Ishtyaq committed
cb5f3fdb9d353a572dd22fb50a110e52d5bb81b1
Parent: fb47bca
Committed by Mariatta <Mariatta@users.noreply.github.com> on 7/20/2018, 4:06:44 PM