Make sum() and product() documentation hyperlinks refer to Iterator methods.
          #86389
        
          
      
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The previous linking seemed confusing: within "the sum() method on iterators", "sum()" was linked to
Sum::sum, notIterator::sum, even though the sentence is talking about the latter. I have rewritten the sentence to be, I believe, clearer, as well as changing the link destinations; applying the same change to theProductdocumentation as well asSum.I reviewed other traits in the same module and did not see similar issues, and previewed the results using
./x.py doc library/std.