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Clean up headings in README #2303

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Run time

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Job	Run time
test ubuntu-latest py3.11	41s
test macos-latest py3.13	46s
test ubuntu-latest py3.13	43s
test ubuntu-latest py3.12	44s
test windows-latest py3.13	1m 29s
test windows-latest py3.11	1m 18s
test macos-latest py3.11	38s
test windows-latest py3.12	1m 46s
test macos-latest py3.12	31s
	8m 36s