Root system documentation #17447

Job	Run time
doctest (1.10, ubuntu-latest)	28m 23s
doctest (1.11-nightly, ubuntu-latest)	26m 27s
test (1.6, short, ubuntu-latest)	1h 43m 57s
doctest (nightly, ubuntu-latest)	26m 51s
test (1.6, long, ubuntu-latest)	59m 27s
doctest (1.10, ubuntu-latest, depwarn=error)	28m 17s
test (1.10, short, ubuntu-latest)	1h 15m 37s
doctest (1.10, macOS, RPTU)	14m 4s
test (1.10, long, ubuntu-latest)	45m 1s
test (1.11-nightly, short, ubuntu-latest)	1h 21m 39s
test (1.11-nightly, long, ubuntu-latest)	54m 0s
test (nightly, short, ubuntu-latest)	1h 18m 21s
test (nightly, long, ubuntu-latest)	8m 41s
test (1.10, short, ubuntu-latest, depwarn=error)	1h 12m 23s
test (1.10, long, ubuntu-latest, depwarn=error)	45m 26s
test (1.10, short, macOS, RPTU)	14m 53s
test (1.10, long, macOS, RPTU)	13m 52s
test (1.10, book, ubuntu-latest)	49m 2s
test (nightly, book, ubuntu-latest)	59m 20s
	14h 45m 41s

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