remove redundant comment #578

Job	Run time
R-CMD-check / macOS-latest (release)	4m 6s
R-CMD-check / windows-latest (devel)	10m 51s
R-CMD-check / windows-latest (release)	10m 41s
R-CMD-check / windows-latest (oldrel)	11m 7s
R-CMD-check / windows-latest (4.1)	5m 23s
R-CMD-check / ubuntu-latest (devel)	1h 5m 3s
R-CMD-check / ubuntu-latest (release)	5m 42s
R-CMD-check / ubuntu-latest (4.3)	8m 41s
R-CMD-check / ubuntu-latest (4.2)	4m 26s
R-CMD-check / ubuntu-latest (4.1)	7m 32s
R-CMD-check / ubuntu-latest (4.0)	1m 47s
R-CMD-check / ubuntu-latest (3.6)	1m 41s
	2h 17m 0s

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