missing instructions

Signed-off-by: vsoch <vsoch@users.noreply.github.com>

config.json

@@ -8,7 +8,7 @@
                      "Vanessa Sochat"
                     ],
     "time":10,
-    "instruction": "Follow the instructions to play the game.",
+    "instructions": "Follow the instructions to play the game.",
     "description": "A fun game to test problem solving skills.",
     "url": "https://www.github.com/expfactory-experiments/whats-missing-zen"
 }