[Rd] minor typos in ?which and ?apropos (PR#9013)

[bolker at zoo.ufl.edu]

 find . -name "*.Rd" | xargs grep "who's"

these should both be "whose"

./src/library/base/man/which.Rd:  a \code{\link{dim}} attribute), the
result is a matrix who's rows each

(also consider "whose rows are each the indices ..." rather than
"whose rows each are the indices ...")

./src/library/utils/man/apropos.Rd:  \item{mode}{character; if not
\code{"any"}, only objects who's

(under details "only those objects that are of mode \code{mode} ..."
but this is getting very grammatically picky indeed)

  Ben


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