docs(reference): Fix response of /v1/apps/<app id>/run endpoint

Author: Joshua Anderson

docs/reference/api-v1.5.rst

@@ -365,7 +365,7 @@ Example Response:
     DEIS_PLATFORM_VERSION: 1.8.0-dev
     Content-Type: application/json
 
-    {"rc": 0, "output": "hi"}
+    [0, "hi\n"]
 
 
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