Clarify how to use high quality previews. #95

Job	Run time
test-stable (macos, 3.9, 12.1, stable)	5m 30s
test-unix-nightly (macos, 3.11, 12.1, nightly)	6m 14s
test-stable (macos, 3.10, 12.1, stable)	5m 38s
test-unix-nightly (linux, 3.11, 12.1, nightly)	3m 43s
test-stable (macos, 3.11, 12.1, stable)	5m 30s
test-stable (macos, 3.12, 12.1, stable)	5m 31s
test-stable (linux, 3.9, 12.1, stable)	3m 46s
test-win-nightly (windows, 3.9, 12.1, nightly)	3m 27s
test-win-nightly (windows, 3.10, 12.1, nightly)	3m 21s
test-stable (linux, 3.10, 12.1, stable)	3m 47s
test-win-nightly (windows, 3.11, 12.1, nightly)	3m 26s
test-stable (linux, 3.11, 12.1, stable)	3m 43s
test-win-nightly (windows, 3.12, 12.1, nightly)	3m 25s
test-stable (linux, 3.12, 12.1, stable)	3m 51s
test-stable (windows, 3.9, 12.1, stable)	3m 14s
test-stable (windows, 3.10, 12.1, stable)	3m 19s
test-stable (windows, 3.11, 12.1, stable)	3m 19s
test-stable (windows, 3.12, 12.1, stable)	3m 23s
	1h 14m 7s

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