docs(tagAppendAttributes): Improve guidance for boolean attributes #754

Job	Run time
routine / routine	1m 51s
routine / routine	1m 51s
R-CMD-check / setup	23s
R-CMD-check / setup	23s
website / pkgdown	1m 53s
website / pkgdown	1m 53s
R-CMD-check / macOS-latest (4.3.3)	7m 11s
R-CMD-check / macOS-latest (4.3.3)	7m 11s
R-CMD-check / windows-latest (devel)	3m 3s
R-CMD-check / windows-latest (devel)	4m 15s
R-CMD-check / windows-latest (4.3.3)	7m 27s
R-CMD-check / windows-latest (4.3.3)	7m 27s
R-CMD-check / windows-latest (4.1)	9m 10s
R-CMD-check / windows-latest (4.1)	9m 10s
R-CMD-check / windows-latest (3.6)	5m 45s
R-CMD-check / windows-latest (3.6)	5m 45s
R-CMD-check / ubuntu-20.04 (devel)	2m 11s
R-CMD-check / ubuntu-20.04 (devel)	2m 11s
R-CMD-check / ubuntu-20.04 (4.3.3)	2m 1s
R-CMD-check / ubuntu-20.04 (4.3.3)	2m 1s
R-CMD-check / ubuntu-20.04 (4.2.3)	2m 35s
R-CMD-check / ubuntu-20.04 (4.2.3)	2m 35s
R-CMD-check / ubuntu-20.04 (4.1.3)	2m 50s
R-CMD-check / ubuntu-20.04 (4.1.3)	2m 50s
R-CMD-check / ubuntu-20.04 (4.0.5)	2m 41s
R-CMD-check / ubuntu-20.04 (4.0.5)	2m 41s
R-CMD-check / ubuntu-20.04 (3.6.3)	2m 33s
R-CMD-check / ubuntu-20.04 (3.6.3)	2m 33s
	1h 44m 20s

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