api-docs: Add admin only notes for channel folder endpoints.

(cherry picked from commit 4b7e0be1ab)

zerver/openapi/zulip.yaml

@@ -24955,13 +24955,11 @@ paths:
       operationId: create-channel-folder
       summary: Create a channel folder
       tags: ["channels"]
+      x-requires-administrator: true
       description: |
         Create a new channel folder, that will be used to organize
         channels in left sidebar.
 
-        Only organization administrators can create a new channel
-        folder.
-
         **Changes**: New in Zulip 11.0 (feature level 389).
       requestBody:
         required: true
@@ -25106,6 +25104,7 @@ paths:
       operationId: patch-channel-folders
       summary: Reorder channel folders
       tags: ["channels"]
+      x-requires-administrator: true
       description: |
         Given an array of channel folder IDs, this method will set the `order`
         property of all of the channel folders in the organization according to
@@ -25157,15 +25156,13 @@ paths:
       operationId: update-channel-folder
       summary: Update a channel folder
       tags: ["channels"]
+      x-requires-administrator: true
       description: |
         Update the name or description of a channel folder.
 
         This endpoint is also used to archive and unarchive
         a channel folder.
 
-        Only organization administrators can update a
-        channel folder.
-
         **Changes**: New in Zulip 11.0 (feature level 389).
       parameters:
         - $ref: "#/components/parameters/ChannelFolderId"