[appendix/math] Fix derivative of scalar with respect to matrix #13
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+ add missing `belongs to` symbol for derivative of vector with respect to scalar
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This PR aligns on using numerator layout for scalar-by-matrix derivative since numerator layout is used for all other derivatives on this page.
If the goal was to go with a mixed layout, hence denominator layout was used for scalar-by-matrix on purpose, then feel free to disregard this PR.
Also, fixed a tiny typo of missing "belongs to" symbol in vector-by-scalar derivative.