[Rd] typo in USArrests.Rd

[Liaw, Andy]

In line 5 of R-1.6.1/src/library/base/man/USArrests.Rd, it should read

\format{A data frame with 50 observations on 4 variables.

I.e., there are only four variables in the data frame, not five.

Cheers,
Andy


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