Documentation Request: Clarity for __matmul__ operator

[mthramann]

What is your issue?

Currently the matmul documentation states that the operator does "matrix multiplication". It's unclear if this means np.matmul semantics, or xr.dot.

It's probably worth explicitly calling out the distinction inline between np.matmul and np.dot, with a short explanation why this isn't the np.matmul behavior.

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[TomNicholas]

Thanks for pointing this out @mthramann ! We would happily accept a PR to clarify this :)

[kmuehlbauer]

fixed by #9060