[docs] [issue10787] [random.gammavariate] Add the expression of the distribution in a comprehensive form for random.gammavariate

[Roundup Robot]

Roundup Robot <devnull at devnull> added the comment:

New changeset 42816be02b9b by Raymond Hettinger in branch '2.7':
Issue 10787: Document the probability density function for random.gammavariate.
http://hg.python.org/cpython/rev/42816be02b9b

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nosy: +python-dev

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