Document EVT_CHAR_HOOK.

Explain that it is sent to the active TLW and not the focus window and that
handling it suppresses all the normal keyboard events.

Mention that it is not generated by wxOSX/Cocoa currently, see #12431.

git-svn-id: https://svn.wxwidgets.org/svn/wx/wxWidgets/trunk@67190 c3d73ce0-8a6f-49c7-b76d-6d57e0e08775

interface/wx/window.h

@@ -237,9 +237,13 @@ enum wxWindowVariant
         See wxKeyEvent.
     @event{EVT_KEY_UP(func)}
         Process a @c wxEVT_KEY_UP event (any key has been released).
+        See wxKeyEvent.
     @event{EVT_CHAR(func)}
         Process a @c wxEVT_CHAR event.
         See wxKeyEvent.
+    @event{EVT_CHAR_HOOK(func)}
+        Process a @c wxEVT_CHAR_HOOK event.
+        See wxKeyEvent.
     @event{EVT_MOUSE_CAPTURE_LOST(func)}
         Process a @c wxEVT_MOUSE_CAPTURE_LOST event. See wxMouseCaptureLostEvent.
     @event{EVT_MOUSE_CAPTURE_CHANGED(func)}