[Rd] Documentation for sd (stats) + suggestion

[S Ellison]

> As far as I can tell, the manual help page for ``sd``
> 
> ?sd
> 
> does not explicitly mention that the formula for the standard deviation is
> the so-called "Bessel-corrected" formula (divide by n-1 rather than n).

See Details, where it says 
"Details:

     Like 'var' this uses denominator n - 1.
"



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