openapi: Rectify wrong examples and schemas.

Some examples mentioned in zulip.yaml did not match their schema.
Change either the schema or the example so that all examples are
valid with respect to their schemas.

zerver/openapi/zulip.yaml

@@ -589,8 +589,12 @@ paths:
           containing string email addresses.
 
           **Changes**: Support for using user/stream IDs was added in Zulip 2.0.0.
+        content:
+          application/json:
             schema:
-          type: string
+              type: array
+              items:
+                type: integer
             example: [9, 10]
         required: true
       - $ref: '#/components/parameters/Topic'
@@ -1282,8 +1286,6 @@ paths:
                              "is_active": true,
                              "email": "hamlet@zulip.com"
                           }
-
-
                     }
 
     patch:
@@ -1302,9 +1304,10 @@ paths:
         in: query
         description: |
           The user's full name.
+        content:
+          application/json:
             schema:
               type: string
-          format: json
             example: NewName
         required: false
       - name: is_admin
@@ -2616,9 +2619,10 @@ paths:
         in: query
         description: |
           Notification sound name.
+        content:
+          application/json:
             schema:
               type: string
-          format: json
             example: ding
       - name: enable_desktop_notifications
         in: query
@@ -2967,19 +2971,21 @@ paths:
         in: query
         description: |
           The new description for the stream.
+        content:
+          application/json:
             schema:
               type: string
-          format: json
-        example: "This stream is related to football dicsussions."
+            example: This stream is related to football dicsussions.
         required: false
       - name: new_name
         in: query
         description: |
           The new name for the stream.
+        content:
+          application/json:
             schema:
               type: string
-          format: json
-        example: "Italy"
+            example: Italy
         required: false
       - name: is_private
         in: query
@@ -3260,7 +3266,7 @@ paths:
       parameters:
       - $ref: '#/components/parameters/Narrow'
       - $ref: '#/components/parameters/Event_types'
-        example: event_types=['message']
+        example: ['message']
       security:
       - basicAuth: []
       responses: