* adding section to roxygen docs for server value of input funcs
* add more server values to roxygen docs
* add more server values
* update more server values in documentation
* Address PR feedback
I reflowed the comments to have a max width of 80 on some files, so there were a flurry of line changes, but the only substantive changes were around Joe's comments.
* Update R/input-slider.R
Co-Authored-By: Hadley Wickham <h.wickham@gmail.com>
* Apply suggestions from code review
Co-Authored-By: Carson Sievert <cpsievert1@gmail.com>
* PR feedback, regenerate docs.
* PR Feedback
* Eliminate extra newline
* passwordInput()'s server value
* varSelectInput()'s server value
* document
* allow the `choices` argument in `checkboxGroupInput()` to be `NULL` or `c()` to keep backward compatibility with Shiny < 1.0.1 (fixes#1649)
* use vapply
* added one more test; reimplemented logic for checking if choice args are null