Docs do not state whether shift+click works for multi-row selection

[nick-youngblut]

The docs at https://rstudio.github.io/DT/shiny.html do not state whether shift + click (or click & hold) works for multi-row selection.

So, one must browse through all of the the issues on this topic (e.g., #305, #706, and #565) to determine whether such as feature exists. It would be helpful for users of the DT package to know that shift + click is not implemented (at least, AFAIK from reading all of the related issues).

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