docs: Use proper code fencing for console outputs

Author: Vedant Damedhar

docs/tutorials/contribution_workflow.md

@@ -12,7 +12,7 @@
 
     ![alt text](../assets/rdev19.png)
 
-```R
+```Rconsole
     > askYesNo("Is this a good example?")
     Is this a good example? (Yes/no/cancel) Yes
     [1] TRUE
@@ -76,6 +76,6 @@ text](../assets/rdev23.png)
 
 ```R
     > askYesNo("Is this a good example?")
-    Is this a good example? (Oh yeah!/don't think so/cancel) Oh yeah!
+    Is this a good example? (Yes/no/cancel) Yes
     [1] TRUE
 ```