wxSizerItem can be used by user code

git-svn-id: https://svn.wxwidgets.org/svn/wx/wxWidgets/trunk@38812 c3d73ce0-8a6f-49c7-b76d-6d57e0e08775

docs/latex/wx/sizeritem.tex

@@ -2,9 +2,10 @@
 \section{\class{wxSizerItem}}\label{wxsizeritem}
 
 The wxSizerItem class is used to track the position, size and other
-attributes of each item managed by a \helpref{wxSizer}{wxsizer}.  In
-normal usage user code should never need to deal directly with a
-wxSizerItem, but derived sizer classes will.
+attributes of each item managed by a \helpref{wxSizer}{wxsizer}. It is not
+usually necessary to use this class because the sizer elements can also be
+identified by their positions or window or sizer pointers but sometimes it may
+be more convenient to use it directly.
 
 
 \wxheading{Derived from}