fix: minor fixes to server-api

Author: nytamin

v1/specification/open-api/server-api.yaml

@@ -122,7 +122,7 @@ paths:
           required: true
         - in: query
           name: force
-          description: "Whether to force deletion. If force is false, it is recommended that the server keeps the Graphic contents for a while, but unlist it. This is to ensure that any currently-on-air Graphics are not affected."
+          description: "Whether to force deletion. If force not true, it is recommended that the server keeps the Graphic contents for a while, but unlist it. This is to ensure that any currently-on-air Graphics are not affected."
           schema:
             type: boolean
             default: false
@@ -913,7 +913,6 @@ components:
             required:
               - renderTarget
               - graphicInstanceId
-              - graphic
       required:
         - graphicInstances
     # Targets / Filters