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[3.11] gh-104337: Clarify random.gammavariate doc entry (GH-104410) (#104481)

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(cherry picked from commit 88c5c58670)

Co-authored-by: Terry Jan Reedy <tjreedy@udel.edu>
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Doc/library/random.rst
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@ -310,8 +310,10 @@ be found in any statistics text.
.. function:: gammavariate(alpha, beta)
Gamma distribution. (*Not* the gamma function!) Conditions on the
parameters are ``alpha > 0`` and ``beta > 0``.
Gamma distribution. (*Not* the gamma function!) The shape and
scale parameters, *alpha* and *beta*, must have positive values.
(Calling conventions vary and some sources define 'beta'
as the inverse of the scale).
The probability distribution function is::
@ -322,7 +324,8 @@ be found in any statistics text.
.. function:: gauss(mu=0.0, sigma=1.0)
Normal distribution, also called the Gaussian distribution. *mu* is the mean,
Normal distribution, also called the Gaussian distribution.
*mu* is the mean,
and *sigma* is the standard deviation. This is slightly faster than
the :func:`normalvariate` function defined below.