[Rd] Spelling (PR#6570)

[p.dalgaard at biostat.ku.dk]

I came across this in connection with an unrelated issue

> beta[2]
Error in beta[2] : object is not subsettable
> beta[2] <- 5
Error in "[<-"(`*tmp*`, 2, value = 5) : object is not subsetable

One of the messages must be wrong, but I need a native English speaker
to tell me which one.

-- 
   O__  ---- Peter Dalgaard             Blegdamsvej 3  
  c/ /'_ --- Dept. of Biostatistics     2200 Cph. N   
 (*) \(*) -- University of Copenhagen   Denmark      Ph: (+45) 35327918
~~~~~~~~~~ - (p.dalgaard at biostat.ku.dk)             FAX: (+45) 35327907