Doc: Added warning to treat group chunks as immutable when using apply#19114

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Commits on Dec 27, 2017

Added note about groupby excluding Decimal columns by default
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Commits on Dec 28, 2017

Moved note about exclusion of Decimal columns from agg functions to automatic-exclusion-of-nuisance-columns section
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Commits on Jan 5, 2018

Adding example of exploding nested lists
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Commits on Jan 7, 2018

docs: Add warning to treat group chunks as immutable to "Flexible apply" section of groupby.rst
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