Vignette: 'CRAN_mirror' -> CRAN'?

[HenrikBengtsson]

The vignette mentions CRAN_mirror;

BiocManager/vignettes/BiocManager.Rmd

Lines 284 to 287 in ce45861

	options(
	repos = c(CRAN_mirror = "file:///path/to/CRAN-mirror"),
	BioC_mirror = "file:///path/to/Bioc-mirror"
	)

Is that CRAN_mirror meant to be CRAN that R recognizes?

FWIW, contrary to BioC_manager, CRAN_mirror is not something R itself is aware of. I searched the BiocManager source code for CRAN_mirror in case it make use of it internally, but couldn't find anything.