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DOC: Clarify ZeroSumNormal covariance documentation (#7904)

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Original file line number	Diff line number	Diff line change
`@@ -2706,9 +2706,9 @@ class ZeroSumNormal(Distribution):`
`2706`	`2706`	`.. math::`
`2707`	`2707`
`2708`	`2708`	`\begin{align*}`
`2709`		`- ZSN(\sigma) = N \Big( 0, \sigma^2 (I - \tfrac{1}{n}J) \Big) \\`
	`2709`	`+ ZSN(\sigma) = N \Big( 0, \sigma^2 (I_K - \tfrac{1}{K}J_K) \Big) \\`
`2710`	`2710`	`\text{where} \ ~ J_{ij} = 1 \ ~ \text{and} \\`
`2711`		`-n = \text{nbrofzero-sum axes}`
	`2711`	`+K = \text{size (length)ofthe constrained axis}`
`2712`	`2712`	`\end{align*}`
`2713`	`2713`
`2714`	`2714`	`Parameters`

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