Refine comments. #1694

Job	Run time
cygwin64-cache	1m 54s
multiple-arch-armv7	22m 53s
multiple-arch-aarch64	22m 36s
utest-regression-blackbox-test	9m 35s
cygwin64	13m 35s
fast	1s
build-ubuntu18	3m 4s
build-cross-aarch64	5m 5s
build-cross-arm	5m 18s
build-centos7	5m 2s
build-ubuntu16	2m 58s
build-ubuntu20	3m 31s
coverage	3m 46s
multiple-arch-amd64	2m 18s
test-done	1s
	1h 41m 37s

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