Root system documentation #17390

Job	Run time
doctest (1.10, ubuntu-latest)	2m 57s
doctest (1.11-nightly, ubuntu-latest)	2m 58s
test (1.6, short, ubuntu-latest)	2m 59s
doctest (nightly, ubuntu-latest)	3m 2s
test (1.6, long, ubuntu-latest)	2m 58s
doctest (1.10, ubuntu-latest, depwarn=error)	2m 57s
test (1.10, short, ubuntu-latest)	3m 0s
doctest (1.10, macOS, RPTU)	2m 58s
test (1.10, long, ubuntu-latest)	2m 57s
test (1.11-nightly, short, ubuntu-latest)	3m 1s
test (1.11-nightly, long, ubuntu-latest)	3m 0s
test (nightly, short, ubuntu-latest)	3m 1s
test (nightly, long, ubuntu-latest)	2m 57s
test (1.10, short, ubuntu-latest, depwarn=error)	2m 59s
test (1.10, long, ubuntu-latest, depwarn=error)	3m 0s
test (1.10, short, macOS, RPTU)	2m 58s
test (1.10, long, macOS, RPTU)	2m 58s
test (1.10, book, ubuntu-latest)	2m 57s
test (nightly, book, ubuntu-latest)	2m 59s
	56m 36s

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