[docs] Add channels:read in slack app scopes
@@ -804,6 +804,7 @@ Steps/flow to be followed by the upstream Hue user to set up their own Hue Slack
| **Permission Scopes** | **Why do we need it?** |
| :---: | :--- |
| channels:history | \*Required by **message.channels** bot event
+| channels:read | Get list of channels where bot is present
| chat:write | Sending messages as Hue App such as greeting message
| files:write | Uploading the query result file in link message thread
| links:read | \*Required by **link_shared** bot event
