Fix schema definitions (spelling, attributes)

api/server-server/definitions/edu.yaml

@@ -24,14 +24,17 @@ properties:
     type: string
     description: The type of ephemeral message.
     example: "m.presence"
+    required: true
   origin:
     type: string
     description: The server name sending the ephemeral message.
-    example: "matrix.org"    
+    example: "matrix.org"
+    required: true
   destination:
     type: string
     description: The server name receiving the ephemeral message.
     example: "elsewhere.com"
+    required: true
   content:
     type: object
     description: The content of the ephemeral message.

api/server-server/definitions/transaction.yaml

@@ -20,7 +20,7 @@ properties:
   origin:
     type: string
     description: |-
-      The ``server_name`` of the hoemserver sending this transaction.
+      The ``server_name`` of the homeserver sending this transaction.
     example: "example.org"
   origin_server_ts:
     type: integer

api/server-server/definitions/unsigned_pdu.yaml

@@ -37,7 +37,6 @@ properties:
   type:
     type: string
     description: Event type
-    required: true
     example: "m.room.message"
   state_key:
     type: string

api/server-server/events.yaml

@@ -65,7 +65,7 @@ paths:
       description: |-
         Retreives a sliding-window history of previous PDUs that occurred in the given room.
         Starting from the PDU ID(s) given in the ``v`` argument, the PDUs that preceded it
-        are retrived, up to the total number given by the ``limit``.
+        are retrieved, up to the total number given by the ``limit``.
       operationId: backfillRoom
       parameters:
         - in: path
@@ -84,7 +84,7 @@ paths:
           name: limit
           type: integer
           description: The maximum number of events to retrieve.
-          required: true # TODO: Verify
+          required: true
           x-example: 10
       responses:
         200: