[DOC] Stop discouraging the use of Array#each #10119
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Given #9622 and #9533, you shouldn't need to rewrite
Array#eachwith a while loop, which is no longer a C method.It still helps other ones like
Array#map. However, it should be on us to optimize the ones that are used frequently in Ruby 3.4, and ones that are not frequently used shouldn't matter. So I think this should be dropped from the Ruby 3.4 document.