Add example of using style in tagList() #779

Job	Run time
R-CMD-check / setup	7s
website / pkgdown	1m 45s
routine / routine	1m 24s
R-CMD-check / macOS-latest (4.4.0)	2m 22s
R-CMD-check / windows-latest (devel)	3m 0s
R-CMD-check / windows-latest (4.4.0)	7m 38s
R-CMD-check / windows-latest (4.2)	6m 33s
R-CMD-check / windows-latest (4.1)	8m 46s
R-CMD-check / windows-latest (3.6)	9m 25s
R-CMD-check / ubuntu-20.04 (devel)	4m 29s
R-CMD-check / ubuntu-20.04 (4.4.0)	2m 0s
R-CMD-check / ubuntu-20.04 (4.3.3)	1m 59s
R-CMD-check / ubuntu-20.04 (4.2.3)	5m 31s
R-CMD-check / ubuntu-20.04 (4.1.3)	5m 32s
R-CMD-check / ubuntu-20.04 (4.0.5)	5m 37s
	1h 6m 8s

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