Update proposals/tab_group_shared_state.md

Co-authored-by: Oliver Dunk <[email protected]>

proposals/tab_group_shared_state.md

@@ -26,7 +26,7 @@ a method that is currently fired when a group is udated, will also fire when the
 ### Behavior
 New restrictions may be placed on shared groups for security and privacy purposes. This is not limited to the tabGroups API and could extend to chrome.tabs and other related API surfaces. The restriction would result in an error that "the action can not be performed due to the object being in a shared state." or a similar error message.
 ### New Permissions
-no new permissions
+This functionality would be gated behind the existing `tabGroups` permission. The new functionality is in line with the existing API and does not need to be guarded separately (see below).
 ### Manifest File Changes
 no new manifest fields
 ## Security and Privacy