Update multi r compilation

Author: avinab-neogy

docs/tutorials/multi_r_compilation.md

@@ -77,13 +77,13 @@ Enter the number corresponding to the selected version:
 !!! Note
     `BUILDDIR` and `TOP_SRCDIR` will be set to the defaults using the label
     `r-devel` whenever a new bash terminal is opened, e.g. when the codespace
-    is restarted. Whenever following instructions that use these variables to 
+    is restarted. Whenever following instructions that use these variables to
     refer to the build and source directory, be sure they are pointing to the
     desired version!
 
     You can check the values any time with:
 
-        ```
+        ```bash
         echo $BUILDDIR
         echo $TOP_SRCDIR
         ```