Elm Analyzer: tweak top-scorers comment

[jiegillet]

@ceddlyburge could you take a look?

You originally wrote

Maybe to something like this:
'aggregateScorers is most easily written using updateGoalCountForPlayer and List.foldl (list.foldr also works, but it a bit les ergonomic).'

But foldl and foldr have the same signature, so there is no change in ergonomy. There might be some efficiency difference, but it's not obvious and I don't want to get into that in an exercise about dictionaries.

[jiegillet]

@exercism/reviewers an I get an approval please? 💛