Tests

update gc doc #564

Job	Run time
examples (stable, ubuntu-latest)	5m 54s
test (stable, ubuntu-latest)	3m 37s
examples (stable, windows-latest)	10m 18s
test (stable, windows-latest)	6m 56s
cross (aarch64-unknown-linux-gnu)	3m 5s
examples (stable, macos-latest)	5m 28s
test (stable, macos-latest)	3m 32s
cross (aarch64-unknown-linux-musl)	3m 22s
examples (1.74.0, ubuntu-latest)	5m 57s
test (1.74.0, ubuntu-latest)	3m 37s
cross (i686-unknown-linux-gnu)	1m 54s
examples (1.74.0, windows-latest)	9m 29s
test (1.74.0, windows-latest)	6m 1s
cross (powerpc64-unknown-linux-gnu)	2m 36s
examples (1.74.0, macos-latest)	6m 13s
test (1.74.0, macos-latest)	2m 58s
cross (riscv64gc-unknown-linux-gnu)	2m 44s
	1h 23m 41s

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