The support is coming in 5.3:
Tested this with R 3.6.1 and RStudio 1.2.1335 on Windows and can confirm the ?? command is busted there as well. As this is an upstream issue I recommend you filing an issue https://github.com/rstudio/rstudio/issues if one has not already been created for this bug.
Ahah thanks. I guess I just assumed it would be named lib for some reason. Who knows why. Thanks for understanding, my next package request will not be like this.