[Rd] Inaccurate documentation for qr.R and qr.Q (PR#8347)

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[Rd] bug in qr.coef() and (therefore) in qr.solve (PR#8476)

i > qr.coeffCS(qr(X+0i),y)-b [,1][,2] [1,] -5.551115e-17+0i 2.775558e-17+0i [2,] 1.110223e-16+0i 1.110223e-16+0i [3,] 0.00e+00+0i 5.551115e-17+0i --050206000203080003040803 Content-Type: text/x-vcard; charset=utf-8; name="sims.vcf"

[Rd] follow-up on qr.coef bug (PR#8478)

an p rows. --090308090600080800090200 Content-Type: text/x-vcard; charset=utf-8; name="sims.vcf" Content-Transfer-Encoding: 7bit Content-Disposition: attachment; filename="sims.vcf" begin:vcard fn:Chris Sims n:Sims;Chris org:Princeton University;Department of Econ