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Fix small typos in introduction and datastructures of tutorial (GH-272)

* Fix small typos in introduction and datastructures
* Use iterable instead of L in the doc for list.extend
J
Jim Fasarakis-Hilliard committed
53c1892dc3de1de612b1cf95dc7bf09f82c1babf
Parent: 6329aea
Committed by Mariatta <Mariatta@users.noreply.github.com> on 2/25/2017, 9:13:33 PM