Add accessibility hint for segmented controls

Tusker/Screens/Utilities/SegmentedPageViewController.swift

@@ -32,6 +32,9 @@ class SegmentedPageViewController: UIPageViewController, UIPageViewControllerDel
         // before the view has necessarily loaded
         segmentedControl = UISegmentedControl(items: titles)
         segmentedControl.addTarget(self, action: #selector(segmentedControlChanged), for: .valueChanged)
+        // the segemented control itself is only focusable when VoiceOver is in Group navigation mode,
+        // so make it clear that to switch tabs the user needs to enter the group
+        segmentedControl.accessibilityHint = "Enter group to select timeline"
         navigationItem.titleView = segmentedControl
     }
     

Tusker/Views/Profile Header/ProfileHeaderView.swift

@@ -83,6 +83,10 @@ class ProfileHeaderView: UIView {
         noteTextView.defaultFont = .preferredFont(forTextStyle: .body)
         noteTextView.adjustsFontForContentSizeCategory = true
         
+        // the segemented control itself is only focusable when VoiceOver is in Group navigation mode,
+        // so make it clear that to switch tabs the user needs to enter the group
+        pagesSegmentedControl.accessibilityHint = "Enter group to select scope"
+        
         NotificationCenter.default.addObserver(self, selector: #selector(updateUIForPreferences), name: .preferencesChanged, object: nil)
     }