update nested describe docstring for error raise

[Graciaaa3]

Change Description

Adding the Raises section to the NestedFrame.describe docstring. The code explicitly raise ValueError for the case where no statistics can be generated from the columns. There will be a combined error message given.

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Documentation Change Checklist

• Any updated docstrings use the NumPy docstring format

[codecov]

Codecov Report

✅ All modified and coverable lines are covered by tests.
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Additional details and impacted files

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  Hits            ?     1709           
  Misses          ?       33           
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[github-actions]

Before [6158e29]	After [ab052ef]	Ratio	Benchmark (Parameter)
41.2±1ms	43.5±0.8ms	1.06	benchmarks.ReassignHalfOfNestedSeries.time_run
2.87±0.01s	2.92±0.04s	1.02	benchmarks.ReadFewColumnsHTTPS.time_run
250M	250M	1	benchmarks.AssignSingleDfToNestedSeries.peakmem_run
10.3±0.07ms	10.2±0.02ms	1	benchmarks.NestedFrameQuery.time_run
1.20±0.01ms	1.20±0.01ms	1	benchmarks.NestedFrameReduce.time_run
177M	176M	1	benchmarks.ReadFewColumnsHTTPS.peakmem_run
270M	270M	1	benchmarks.ReassignHalfOfNestedSeries.peakmem_run
31.8±0.2ms	31.5±0.7ms	0.99	benchmarks.AssignSingleDfToNestedSeries.time_run
136M	135M	0.99	benchmarks.CountNestedBy.peakmem_run
103M	102M	0.99	benchmarks.NestedFrameAddNested.peakmem_run

Click here to view all benchmarks.

[gitosaurus]

LGTM!

[dougbrn]

Nice!