[docs] [issue25494] Four quotes used to begin docstring

[John Mark Vandenberg]

John Mark Vandenberg added the comment:

The additional quotation mark is shown in help()

>>> help(statistics.median_grouped)
Help on function median_grouped in module statistics:

median_grouped(data, interval=1)
    "Return the 50th percentile (median) of grouped continuous data.

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Python tracker <report at bugs.python.org>
<http://bugs.python.org/issue25494>
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