Root system documentation #17494

Job	Run time
doctest (1.10, ubuntu-latest)	27m 37s
doctest (1.11-nightly, ubuntu-latest)	33m 1s
doctest (nightly, ubuntu-latest)	31m 6s
doctest (1.10, ubuntu-latest, depwarn=error)	27m 7s
doctest (1.10, macOS, RPTU)	13m 32s
test (1.6, short, ubuntu-latest)	1h 25m 21s
test (1.6, long, ubuntu-latest)	58m 15s
test (1.10, short, ubuntu-latest)	1h 12m 15s
test (1.10, long, ubuntu-latest)	45m 31s
test (1.11-nightly, short, ubuntu-latest)	1h 22m 0s
test (1.11-nightly, long, ubuntu-latest)	53m 8s
test (nightly, short, ubuntu-latest)	1h 23m 21s
test (nightly, long, ubuntu-latest)	57m 37s
test (1.10, short, ubuntu-latest, depwarn=error)	1h 12m 49s
test (1.10, long, ubuntu-latest, depwarn=error)	44m 49s
test (1.10, short, macOS, RPTU)	14m 41s
test (1.10, long, macOS, RPTU)	13m 51s
test (1.10, book, ubuntu-latest)	49m 10s
test (nightly, book, ubuntu-latest)	2h 30m 20s
	16h 55m 31s

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