[doc] Update reference in R vignettes. (#9323)

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Jiaming Yuan 2023-06-26 18:32:11 +08:00 committed by GitHub
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@ -18,13 +18,11 @@
publisher={Institute of Mathematical Statistics}
}
@misc{
Bache+Lichman:2013 ,
author = "K. Bache and M. Lichman",
year = "2013",
title = "{UCI} Machine Learning Repository",
url = "http://archive.ics.uci.edu/ml/",
institution = "University of California, Irvine, School of Information and Computer Sciences"
url = "https://archive.ics.uci.edu/",
institution = "University of California, Irvine, School of Information and Computer Sciences"
}