Added links to useful discussions of groupby and SettingWithCopyWarning#21916

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supern8ent wants to merge 2 commits intopandas-dev:masterfrom

supern8ent:doc_17505

Commits on Jul 14, 2018

In the indexing tutorial, added a link to a very thorough discussion of the SettingWithCopyWarning problem. This partially addresses issue 17505.
Nathan Lloyd
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In groupby.rst added link to a nice alternative explanation to groupby usage.
Nathan Lloyd
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