fix(writeapi): more tweaks to schema files

public/openapi/write/admin/settings/setting.yaml

@@ -11,6 +11,24 @@ put:
       required: true
       description: backend id of the setting to update
       example: maximumRelatedTopics
+    - in: path
+      name: value
+      schema:
+        type: string
+      required: true
+      description: the value of the new setting
+      example: 2
+  requestBody:
+    required: true
+    content:
+      application/json:
+        schema:
+          type: object
+          properties:
+            value:
+              type: string
+              description: the value of the new setting
+              example: 2
   responses:
     '200':
       description: Admin setting updated