Use forward slash in tools command

so that it works on Windows and Linux

Author: cderv

tools/gallery-screenshot.R

@@ -2,12 +2,8 @@
 # Screenshot example for Gallery Image -----------------------------------
 
 ## Example: Run this command from root repo (on Windows)
-##     quarto run .\tools\gallery-screenshot.R .\docs\gallery\dashboards\dashing-through-snow.png  https://mine.quarto.pub/dashing-through-snow-py/
-
-## Example: Run this command from root repo (on Mac/Linux)
 ##     quarto run ./tools/gallery-screenshot.R ./docs/gallery/dashboards/dashing-through-snow.png  https://mine.quarto.pub/dashing-through-snow-py/
 
-
 args <- commandArgs(trailingOnly = TRUE)
 
 # Check if the correct number of arguments are provided