DOC: <MatrixNormal Example in Documentation not updated as per latest version ' prefix>

[roesta07]

Issue with current documentation:

The compute_corr parameter in pm.LKJCholeskyCov is set to True by default, which causes the error.
Also discussed here: https://discourse.pymc.io/t/matrixnormal-example-in-documentation-throws-an-error/16171

Idea or request for content:

Setting compute_corr=False resolves the problem. Will add a PR in a while.

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