DOC: Clarify ZeroSumNormal covariance documentation (#7904)#7988

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Commits on Dec 5, 2025

DOC: clarify ZeroSumNormal covariance (use K for constrained-axis size) (#7904)
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Commits on Dec 6, 2025

Fix ZeroSumNormal docstring: use K instead of n in covariance formula
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