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improve `autofarm` documentation #11516

Job	Run time
check-pr	2s
docs / Build linux64	1m 10s
lint / lint	22s
package / Linux / Build linux64	1m 30s
test / Windows MSVC / Build win64	24m 0s
package / Windows / Build win64	26m 36s
test / Linux gcc-12 / Build linux64	1m 35s
test / Linux gcc-11 / Build linux64	1m 42s
test / Run Linux test suite (gcc-12, all plugins) / Test (ubuntu, gcc-12, all plugins, default config)	55s
test / Run Linux test suite / Test (ubuntu, gcc-11, default plugins, default config)	55s
test / Run Windows test suite (empty config) / Test (windows, msvc, default plugins, empty config)	1m 43s
test / Run Windows test suite / Test (windows, msvc, default plugins, default config)	1m 17s
	1h 1m 47s

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