Francesco Bonazzi comments

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                                            Francesco Bonazzi

@oscarbenjamin @asmeurer let me know if this explanation is clear enough.

We use \circ for Hadamard products. It looks like \odot is more frequent. I kept by the convention of the printers of HadamardProduct.

I've merged this PR as the explanation looks good to me. Should issues arise, I will open a new PR.