[docs] Add constraint documentation for various `reduce`-like functions in simd.mojo

[Brian-M-J]

Fixes #2237 for reduce-like functions in simd.mojo:

• Adds documentation for constraint on value of size_out not exceeding width of input vector in reduce_add, reduce_mul, reduce_max and reduce_min.

Signed-off-by: Brian-M-J [email protected]

[Brian-M-J]

Is the constraint on size_out the only one for reduce_add or does "The element type of the vector must be integer or FP." also apply?

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[modularbot]

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