Fix a few events/endpoints schemas for better rendering

Signed-off-by: Kévin Commaille <zecakeh@tedomum.fr>

data/api/client-server/cross_signing.yaml

@@ -162,7 +162,6 @@ paths:
           application/json:
             schema:
               type: object
-              title: Signatures
               additionalProperties:
                 type: object
                 additionalProperties:

data/event-schemas/schema/m.direct.yaml

@@ -11,10 +11,12 @@ properties:
   content:
     additionalProperties:
       type: array
-      title: User ID
       items:
         type: string
     type: object
+    description: |-
+      The mapping of user ID to a list of room IDs of the 'direct' rooms for
+      that user ID.
   type:
     enum:
       - m.direct

data/event-schemas/schema/m.ignored_user_list.yaml

@@ -10,12 +10,10 @@ properties:
     properties:
       ignored_users:
         type: object
-        title: "Ignored users"
         description: "The map of users to ignore"
         patternProperties:
           "^@":
             type: "object"
-            title: "Ignored User"
             description: "An empty object for future enhancement"
             x-pattern: "$USER_ID"
     required:

data/event-schemas/schema/m.receipt.yaml

@@ -9,19 +9,20 @@ allOf:
 properties:
     content:
         type: object
+        description: |-
+            The mapping of event ID to a collection of receipts for this
+            event ID. The event ID is the ID of the event being acknowledged
+            and *not* an ID for the receipt itself.
         patternProperties:
             "^\\$":
                 type: object
                 x-pattern: "$EVENT_ID"
-                title: Receipts
+                title: Event Receipts
                 description: |-
-                    The mapping of event ID to a collection of receipts for this
+                    The collection of receipts for this event ID.
-                    event ID. The event ID is the ID of the event being acknowledged
-                    and *not* an ID for the receipt itself.
                 properties:
                     "m.read":
                         type: object
-                        title: Users
                         description: |-
                             A collection of users who have sent `m.read` receipts for
                             this event.
@@ -48,7 +49,6 @@ properties:
                                             (default).
                     "m.read.private":
                         type: object
-                        title: Own User
                         description: |-
                             Similar to `m.read`, the users who have sent `m.read.private`
                             receipts for this event. Due to the nature of private read