[Rd] Typo in the documentation of prcomp. (PR#569)

[bhm@math.uio.no]

The help for prcomp on R 1.0.0 states that the component sdev of the
return value is the eigenvalues of the cov matrix.  Am I completely
mistaken, or should this be the _square root_ of the eigenvalues?

Also, the documentation is not very clear about how tol is used to omit
components.  (The _code_ is clear, though. :-)

-- 
B/H

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