make examples agree with schema

data/event-schemas/examples/m.secret.request.yaml

@@ -1,6 +1,9 @@
 {
+  "type": "m.secret.request",
+  "content": {
     "name": "org.example.some.secret",
     "action": "request",
     "requesting_device_id": "ABCDEFG",
     "request_id": "randomly_generated_id_9573"
   }
+}

data/event-schemas/examples/m.secret.send.yaml

@@ -1,4 +1,7 @@
 {
+  "type": "m.secret.send",
+  "content": {
     "request_id": "randomly_generated_id_9573",
     "secret": "ThisIsASecretDon'tTellAnyone"
   }
+}