DOC: Updated links to 2 tutorials in tutorials.rst#19857

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jreback merged 2 commits intopandas-dev:masterfrom

tommyod:jvns_tutorial_links

Feb 24, 2018

Commits on Feb 24, 2018

Changed links to 2 tutorials from v0.2 to v0.1, as v0.2 did not exist for all of them
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Updated all pandas-tutorial links to v0.2, added chapter 9 of tutorial
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