Update docs/literate/src/files/first_steps/changing_trixi.jl

Co-authored-by: Andrew Winters <andrew.ross.winters@liu.se>

docs/literate/src/files/first_steps/changing_trixi.jl

@@ -19,7 +19,7 @@
 #   you want to save Trixi.jl. Then click `Clone` and Trixi.jl will be cloned to your computer. 
 
 # Now you cloned Trixi.jl and only need to tell Julia to use the local clone as the package sources:
-# - Open a terminal using `Win+R` and `cmd`. Navigate to the folder with the cloned Trixi.jl using `cd`.
+# - Open a terminal using `Win+r` and `cmd`. Navigate to the folder with the cloned Trixi.jl using `cd`.
 # - Create a new directory `run`, enter it, and start Julia with the `--project=.` flag:
 #   ```shell
 #   mkdir run