Update binderhub/event-schemas/launch.json

Co-authored-by: Tim Head <[email protected]>

Author: bitnik

binderhub/event-schemas/launch.json

@@ -24,7 +24,7 @@
         },
         "ref": {
             "type": "string",
-            "description": "Resolved reference to the repo when it is being launched"
+            "description": "Resolved reference for the repo at the time of launch"
         },
         "status": {
             "enum": ["success", "failure"],