Allow setting hints for multi-line wxTextCtrl when supported.

Don't prevent people from using hints in wxMSW and wxGTK2, where they work
with multiline text controls too, even though they do not work with wxGTK3 nor
wxOSX.

Closes #14456.

git-svn-id: https://svn.wxwidgets.org/svn/wx/wxWidgets/trunk@78316 c3d73ce0-8a6f-49c7-b76d-6d57e0e08775

interface/wx/textentry.h

@@ -473,9 +473,9 @@ public:
             focus and wxEVT_TEXT events, you must call wxEvent::Skip() on them
             so that the generic implementation works correctly.
 
-        @remarks Hints can only be used for single line text controls,
-            native multi-line text controls don't support hints under any
-            platform and hence wxWidgets doesn't provide them neither.
+        @remarks Hints can be used for single line text controls under all
+            platforms, but only MSW and GTK+ 2 support them for multi-line text
+            controls, they are ignored for them under the other platforms.
 
         @since 2.9.0
      */