[Rd] lapply and vapply Primitive Documentation

[Cole Miller]

The documentation of ?lapply includes:

> lapply and vapply are primitive functions.

However, both evaluate to FALSE in `is.primitive()`:

    is.primitive(vapply)
    #FALSE

    is.primitive(lapply)
    #FALSE

It appears that they are not primitives and that the documentation
might be outdated. Thank you for your time and work.

Cole Miller

P.S. During research, my favorite `help()` is `?.Internal()`: "Only
true R wizards should even consider using this function..." Thanks
again!