Clarified that closest() returns 0 or 1 element /per original element/.

[jmm]

I don't think the closest() documentation is clear that it will return 0 or 1 element per original element:

Get the first element that matches the selector

The returned jQuery object contains zero or one element

This patch is an attempt to clarify that.

[kswedberg]

Thanks so much for the pull request! I'm so sorry that my feeble attempt at merging it in somehow lost your commit authorship. I'm not sure how exactly that happened, but I'll look into it and try not to let it happen again.

[jmm]

Thanks Karl, don't worry about it. How does the problem actually show up? I see my commits in the repo and in the github history, and I see your merge commits.

[kswedberg]

oh, wow, your commits are there, after all! I just hadn't scrolled down far enough. that's what I get for taking so long to merge them in! :)

[jmm]

Yeah, that'll teach you to keep my pull requests cooling their heels!

Thanks,
Jesse