user docs: Document admin-only posting in stream-permissions.md.

templates/zerver/help/include/sidebar.md

@@ -148,7 +148,7 @@
 * [View all bots in your organization](/help/view-all-bots-in-your-organization)
 
 ## Stream management
-* [Stream permissions](/help/stream-privacy-settings)
+* [Stream permissions](/help/stream-permissions)
 * [Delete or archive a stream](/help/delete-a-stream)
 * [Set default streams for new users](/help/set-default-streams-for-new-users)
 * [Rename a stream](/help/rename-a-stream)

templates/zerver/help/stream-permissions.md

@@ -36,12 +36,15 @@ At a high level:
 | See subscriber list   | ✔   | ✔       | ✔    |
 | See full history      | ✔   | ✔       | ✔    |
 | See estimated traffic | ✔   | ✔       | ✔    |
+| Post                  | ✔   | [1]            |             |
 | Change the privacy    | ✔   |                |             |
 | Rename                | ✔   |                |             |
 | Edit the description  | ✔   |                |             |
 | Remove others         | ✔   |                |             |
 | Delete                | ✔   |                |             |
 
+[1] Configurable.
+
 ### Private streams
 
 |                       | Org admins | Stream members | Org members |
@@ -49,15 +52,18 @@ At a high level:
 | Join                  |            | —        |             |
 | Add others            |            | ✔       |             |
 | See subscriber list   | ✔   | ✔       |             |
-| See full history      |            | [1]            |             |
+| See full history      |            | [2]            |             |
 | See estimated traffic | ✔   | ✔       |             |
-| Change the privacy    | [2]        |                |             |
+| Post                  | ✔   | [1]            |             |
+| Change the privacy    | [3]        |                |             |
 | Rename                | ✔   |                |             |
 | Edit the description  | ✔   |                |             |
 | Remove others         | ✔   |                |             |
 | Delete                | ✔   |                |             |
 
-[1] Depends on the stream type.
+[1] Configurable.
 
-[2] Yes, but only if subscribed. If you have a private stream without an
+[2] Depends on the stream type.
+
+[3] Yes, but only if subscribed. If you have a private stream without an
 admin, you'll have to add an admin in order to change the stream's privacy.