Fix markdown format problem

The example wasn't proper JSON. Make it proper with good formatting.

Signed-off-by: Matt Spinler <spinler@us.ibm.com>
Change-Id: Idbbd7d13357430351162a3e0b0a0ea26c86ff712
diff --git a/docs/control/events.md b/docs/control/events.md
index 7263541..7544c96 100644
--- a/docs/control/events.md
+++ b/docs/control/events.md
@@ -655,10 +655,28 @@
 there are more than one event using this action, the maximum speed derived from
 the mapping of all groups will be set to the zone's target.
 
-... { "name": "target_from_group_max", "groups": [ { "name":
-"zone0_ambient", "interface": "xyz.openbmc_project.Sensor.Value", "property":
-{ "name": "Value" } } ], "neg_hysteresis": 1, "pos_hysteresis": 0, "map": [
-{ "value": 10.0, "target": 38.0 }, ... ] }
+```json
+{
+  "name": "target_from_group_max",
+  "groups": [
+    {
+      "name": "zone0_ambient",
+      "interface": "xyz.openbmc_project.Sensor.Value",
+      "property": {
+        "name": "Value"
+      }
+    }
+  ],
+  "neg_hysteresis": 1,
+  "pos_hysteresis": 0,
+  "map": [
+    {
+      "value": 10.0,
+      "target": 38.0
+    }
+  ]
+}
+```
 
 The above JSON will cause the action to read the property specified in the group
 "zone0_ambient" from all members of the group. The change in the group's members