clarify offsets serialization #2043
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protolambda
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scope:SSZ
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Small PR to clarify the offset length used in SSZ, thanks @imnisen, fix #1963.
Alternatively we could use
sum(fixed_lengths + variable_lengths[:i]).to_bytes(BYTES_PER_LENGTH_OFFSET, "little"), but I think it's fine to just explicitly state it is anuint32, as the offset length is a constant, not configurable.