Fix docs for tabs.close_position in default.json (#37729)

Minor docs fix.
Seems like 0a4ff2f475 accidentally added
"hidden" to the docs of both – `close_position` and `show_close_button`.

Release Notes:

- N/A

Co-authored-by: tastenbier <>

assets/settings/default.json

@@ -962,7 +962,7 @@
     // Show git status colors in the editor tabs.
     "git_status": false,
     // Position of the close button on the editor tabs.
-    // One of: ["right", "left", "hidden"]
+    // One of: ["right", "left"]
     "close_position": "right",
     // Whether to show the file icon for a tab.
     "file_icons": false,