[Rd] config.site settings for M3 Mac typo in manual?

[Duncan Murdoch]

I've just upgraded to an M3 Mac laptop, and I'm working through getting 
the right configure settings to build R.

The Installation and Administration manual says to have this in config.site:

FFLAGS="-g -O2 -mmacos-version-min=11.0"
FCFLAGS="-g -O2 -mmacos-version-min=11.0"

but those give an error on my system, with it suggesting the FFLAGS and 
FCFLAGS version option should be -mmacosx-version-min=11.0.  I don't 
know if that's a typo or a change.

Besides