Closes #22 #181 #201 #292 #298 Variety of small-scale general documentation updates #625

Job	Run time
Documentation	0s
Render README	0s
Validation	0s
Lint / Get R version	2s
Links / Validate Links	4s
Check / (4.1)	2m 18s
Check / (4.2)	2m 29s
Check / (4.3)	2m 49s
Code Coverage / Get R version	2s
Man Pages / Get R version	2s
Spelling / Get R version	1s
Code Style / Get R version	1s
Spelling / Spellcheck	2m 4s
Lint / Lint	2m 38s
Code Style / Code Style	2m 7s
Man Pages / Roxygen	2m 22s
Code Coverage / Test Coverage	2m 51s
Code Coverage / Generate badge for coverage	1s
	19m 51s

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