Use CargoCallbacks::new() in documentation #1857

Job	Run time
docs	35s
check-cfg	22s
msrv	2m 58s
minimal	16s
quickchecking	43s
rustfmt-clippy	30s
test-expectations (ubuntu-latest)	1m 17s
test (ubuntu-latest, 9.0, 1, 0, 0, 0, 0)	2m 10s
test-expectations (macos-latest)	3m 26s
test-book	11s
test (ubuntu-latest, 9.0, 1, 0, 0, 1, 0)	2m 14s
test (ubuntu-latest, 9.0, 1, 0, 1, 0, 0)	1m 59s
test (ubuntu-latest, 9.0, 1, 0, 1, 1, 0)	2m 20s
test (ubuntu-latest, 9.0, 1, 1, 0, 0, 0)	2m 55s
test (ubuntu-latest, 9.0, 1, 1, 0, 1, 0)	3m 7s
test (ubuntu-latest, 9.0, 1, 1, 1, 0, 0)	3m 9s
test (ubuntu-latest, 9.0, 1, 1, 1, 1, 0)	2m 18s
test (ubuntu-latest, 16.0, 1, 0, 0, 0, 0)	3m 8s
test (ubuntu-latest, 16.0, 1, 0, 0, 1, 0)	3m 32s
test (ubuntu-latest, 16.0, 1, 0, 1, 0, 0)	4m 4s
test (ubuntu-latest, 16.0, 1, 0, 1, 1, 0)	3m 35s
test (ubuntu-latest, 16.0, 1, 1, 0, 0, 0)	2m 59s
test (ubuntu-latest, 16.0, 1, 1, 0, 1, 0)	5m 17s
test (ubuntu-latest, 16.0, 1, 1, 1, 0, 0)	3m 34s
test (ubuntu-latest, 16.0, 1, 1, 1, 1, 0)	2m 52s
test (ubuntu-latest, 16.0, 0, 0, 1)	2m 51s
test (macos-latest, 9.0, 0, 0, 0)	2m 16s
	1h 4m 38s

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