Set wxTextCtrl::m_verRichEdit to 4 for RichEdit 4.1.

Set m_verRichEdit to a different value for the version 4.1 of the control as
it behaves subtly differently from the previous versions.

Also clarify that value of 2 is used for both 2.0 and 3.0 versions of the
control.

No real changes yet.

git-svn-id: https://svn.wxwidgets.org/svn/wx/wxWidgets/trunk@65563 c3d73ce0-8a6f-49c7-b76d-6d57e0e08775

include/wx/msw/textctrl.h

@@ -237,8 +237,9 @@ protected:
 
 #if wxUSE_RICHEDIT
     // we're using RICHEDIT (and not simple EDIT) control if this field is not
-    // 0, it also gives the version of the RICHEDIT control being used (1, 2 or
-    // 3 so far)
+    // 0, it also gives the version of the RICHEDIT control being used
+    // (although not directly: 1 is for 1.0, 2 is for either 2.0 or 3.0 as we
+    // can't nor really need to distinguish between them and 4 is for 4.1)
     int m_verRichEdit;
 #endif // wxUSE_RICHEDIT