Update outdated references to WinXP in documentation.

interface/wx/statusbr.h

@@ -96,10 +96,9 @@ public:
 
     @remarks
     Notice that only the first 127 characters of a string will be shown in
-    status bar fields under pre-XP MSW systems (or even under later systems if
-    a proper manifest indicating that the program uses version 6 of common
-    controls library is not used). This is a limitation of the native control
-    on these platforms.
+    status bar fields under Windows if a proper manifest indicating that the
+    program uses version 6 of common controls library is not used. This is a
+    limitation of the native control on these platforms.
 
     @library{wxcore}
     @category{miscwnd}