Improve YJIT documentation for Ruby 3.3 #9263
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Following up #9068, this PR improves YJIT documentation for Ruby 3.3. Now that we moved documentation for Ruby 3.2 to
ruby_3_2#9245, we don't need to mention Ruby 3.2.--yjit-call-thresholdsince it was not explained anywhere.--yjit-code-gcfrom "Performance Tips" since we don't really recommend it anymore (hence disabled by default). I moved the documentation to the place explaining--yjit-code-gcoption instead.ratio_in_yjitfor tuning--yjit-exec-mem-size, which became more accessible in Ruby 3.3.--yjit-cold-thresholdand two-step--yjit-call-threshold.--yjit-call-threshold.