change name of question icon to fix bug in helper

[lmsimp]

Hello, I have been using shinyhelper for my apps and have noticed that the icon for question mark has changed name from from question-circle to circle-question.

I was previously getting this warning when running my app

This Font Awesome icon ('question-circle') does not exist:
* if providing a custom `html_dependency` these `name` checks can 
  be deactivated with `verify_fa = FALSE

This is fixed in this PR.

I have not bumped the package version in DESCRIPTION or NEWS as I was unsure of your versioning system but did update the documentation with roxygen2.

> sessionInfo()
R version 4.2.0 (2022-04-22)
Platform: x86_64-apple-darwin17.0 (64-bit)
Running under: macOS Monterey 12.4

Matrix products: default
LAPACK: /Library/Frameworks/R.framework/Versions/4.2/Resources/lib/libRlapack.dylib

locale:
[1] en_GB.UTF-8/en_GB.UTF-8/en_GB.UTF-8/C/en_GB.UTF-8/en_GB.UTF-8

attached base packages:
[1] stats     graphics  grDevices utils     datasets  methods   base     

other attached packages:
 [1] shinydashboardPlus_2.0.3 shinydashboard_0.7.2     FNN_1.1.3.1             
 [4] shinyjs_2.1.0            shinyWidgets_0.7.3       dendextend_1.16.0       
 [7] tidyr_1.2.1              patchwork_1.1.2          ggplot2_3.3.6           
[10] colorspace_2.0-3         colourpicker_1.1.1       shinythemes_1.2.0       
[13] DT_0.25                  shiny_1.7.2              dplyr_1.0.10            
[16] shinyhelper_0.3.2