Make comment consume 100% width in GRID example

Author: iamanthropic

examples/data/grid.json

@@ -99,14 +99,14 @@
           "type": "section",
           "grid": { "layout": "row" },
           "items": ["email"]
+        },
+        {
+          "key": "comment",
+          "type": "textarea",
+          "placeholder": "Make a comment"
         }
       ]
     },
-    {
-      "key": "comment",
-      "type": "textarea",
-      "placeholder": "Make a comment"
-    },
     {
       "type": "submit",
     "style": "btn-info",