Fix missing delta export and a typo in supplementary guidelines #3671
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Changes
I think in #3242 when updating the supplementary guidelines, we lost the initial export for one of the delta examples. I didn't see it when the original PR was open.
CC @dashpole, could you check if this is correct or whether I am missing something?
The second change just removes a redundant
a
, since I just stumbled across it I thought I'd remove it while I am at it.