Give a better hint

.vscode/tasks.json

@@ -10,8 +10,9 @@
                 // Note that the environment variable, R_HOME, must be set prior to `cargo build`
                 // in order to build the ark dependency libR-sys. Once libR-sys is built,
                 // R_HOME is not required for subsequent runs of `cargo build`.
-                // Execute something like the following in a terminal prior to running `cargo build`:
-                // set R_HOME=C:\Program Files\R\R-4.3.2
+                // Prior to running `cargo build`, execute something like this:
+                // PowerShell:    $env:R_HOME = "C:\\Program Files\\R\\R-4.3.2"
+                // bash:          export R_HOME="C:\\Program Files\\R\\R-4.3.2"
                 "command": "cargo build"
             },
             "problemMatcher": [