[Rd] xtfrm documentation typo

[Øystein Sørensen]

I believe there is a typo in the documentation to base::xtfrm, in the file
xtfrm.Rd:

Under Details, it says:

 "... The \code{\link[survival]{Surv}} method sorts first on times and then
on status code(s), finally on \code{timme2} if present. ...".

I believe timme2 should be replaced by time2, since time2 is an argument to
Surve. Then it becomes:

"... The \code{\link[survival]{Surv}} method sorts first on times and then
on status code(s), finally on \code{time2} if present. ..."

Best,
Øystein Sørensen

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