Specify that application services receive events in the CSAPI format

Fixes https://github.com/matrix-org/matrix-doc/issues/1269

This is also supposed to fix the 'age' problem, however that is a larger problem with the event schemas that is reserved for a future PR/commit.
Reference: https://github.com/matrix-org/matrix-doc/issues/1294
Reference: https://github.com/matrix-org/matrix-doc/issues/1524

api/application-service/transactions.yaml

@@ -21,8 +21,6 @@ schemes:
   - https
   - http
 basePath: "/"
-consumes:
-  - application/json
 produces:
   - application/json
 paths:
@@ -53,37 +51,16 @@ paths:
             type: object
             example: {
               "events": [
-                {
-                  "age": 32,
-                  "content": {
-                      "body": "incoming message",
-                      "msgtype": "m.text"
-                  },
-                  "event_id": "$14328055551tzaee:localhost",
-                  "origin_server_ts": 1432804485886,
-                  "room_id": "!TmaZBKYIFrIPVGoUYp:localhost",
-                  "type": "m.room.message",
-                  "user_id": "@bob:localhost"
-                },
-                {
-                  "age": 1984,
-                  "content": {
-                      "body": "another incoming message",
-                      "msgtype": "m.text"
-                  },
-                  "event_id": "$1228055551ffsef:localhost",
-                  "origin_server_ts": 1432804485886,
-                  "room_id": "!TmaZBKYIFrIPVGoUYp:localhost",
-                  "type": "m.room.message",
-                  "user_id": "@bob:localhost"
-                }
+                {"$ref": "../../event-schemas/examples/m.room.member"},
+                {"$ref": "../../event-schemas/examples/m.room.message#m.text"}
               ]
             }
-            description: "Transaction informations"
+            description: Transaction information
             properties:
               events:
                 type: array
-                description: A list of events
+                description: |-
+                  A list of events, formatted as per the Client-Server API.
                 items:
                   type: object
                   title: Event
@@ -92,7 +69,6 @@ paths:
         200:
           description: The transaction was processed successfully.
           examples:
-            application/json: {
-            }
+            application/json: {}
           schema:
             type: object