Fix R update script

README.md

@@ -41,7 +41,7 @@ Last updated: 2022-01-02
     - [Make an existing Windows 10 account user an administrator](#make-an-existing-windows-10-account-user-an-administrator)
     - [Creating more VM disk space](#creating-more-vm-disk-space)
   - [Updating system software](#updating-system-software)
-  - [Updating RStudio and RStudio Server](#updating-rstudio-and-rstudio-server)
+  - [Updating R, RStudio Desktop, and RStudio Server](#updating-r-rstudio-desktop-and-rstudio-server)
   - [Scheduling a restart](#scheduling-a-restart)
   - [Adding a drive](#adding-a-drive)
   - [Logging](#logging)
@@ -304,9 +304,12 @@ Once configured, the user will no longer need to enter their password to access
   - The server regularly installs security updates unattended
   - If the kernel, java, systemd, or other major components are updated, the system should be restarted.
 
-### Updating RStudio and RStudio Server
+### Updating R, RStudio Desktop, and RStudio Server
 
-  -`script-system-update-r`
+- `script-system-update-r` `R_VERSION` `RSTUDIO_VERSION`
+  - Example `R_VERSION`: `4.1.2`
+  - Example `RSTUDIO_VERSION`: `2021.09.1-372`
+  - Links to latest available [R](https://docs.rstudio.com/resources/install-r/) and [RStudio](https://www.rstudio.com/products/rstudio/download/#download) versions
 
 ### Scheduling a restart