[docs] Minor revision of trailing closure matching educational note #33834
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Belatedly coming to the educational note on trailing closure matching. This is a revision that principally reorganizes the information.
The bit about the warning when forwards and backwards scans produce different results is pretty key, as it's likely to be the reason that users encounter this note; therefore, move that above the details about the forward scanning rule and insert a bit about how to silence this warning.
Insert a brief summary about the forward scanning rule's detailed implementation upfront, and only for people that need the details, provide the nitty gritty definitions in their own sections afterwards.