[Rd] Bug 16719: kruskal.test documentation for formula

[Thomas Levine]

Thomas Levine writes:
> I have yet to find any example of my proposed changes causing a
> regression. I believe that the most reasonable thing that it might
> break is something that depends on either kruskal.test raising an
> error or that depends on the specific text in the error message.
>
> If the limited testing is a concern, I could find a way to install
> all of the packages and run all of their examples.

In case my April message is hard to find, I have attached the packages
redundantly to this email.

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