GUI -- Clean up local test events.

Change-Id: I112ccb2db65a8190ff03c274717abf9735084e81
diff --git a/web/gui/src/main/webapp/json/ev/colors/scenario.json b/web/gui/src/main/webapp/json/ev/colors/scenario.json
index a457123..dd17828 100644
--- a/web/gui/src/main/webapp/json/ev/colors/scenario.json
+++ b/web/gui/src/main/webapp/json/ev/colors/scenario.json
@@ -7,6 +7,7 @@
     "lastAuto": 29
   },
   "description": [
-    "Press 'S' to load initial events."
+    "Press '=' to load initial events.",
+    "Press '-' to fire further events."
   ]
 }