[Rd] Wrong explanation on 'ylab' in hist.Rd

[suh@rto_@@ggo@o m@iii@g oii y@hoo@com]

Description of arguments main, xlab, ylab in hist.Rd in current R devel and R patched ends with this.
the default \code{ylab} is \code{"Frequency"} iff \code{probability} is true

In fact, if 'probability' is true, the histogram doesn't represent frequencies.

It should be
the default \code{ylab} is \code{"Frequency"} iff \code{freq} is true