Mention status bar fields limits under pre-XP MSW systems.

Mention that before comctl32.dll status bar fields were limited to 127
characters only.

See #12709.

git-svn-id: https://svn.wxwidgets.org/svn/wx/wxWidgets/trunk@66257 c3d73ce0-8a6f-49c7-b76d-6d57e0e08775

interface/wx/statusbr.h

@@ -78,6 +78,13 @@ public:
     It is possible to create controls and other windows on the status bar.
     Position these windows from an OnSize() event handler.
 
+    @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.
+
     @library{wxcore}
     @category{miscwnd}