fixed comment and docs for GetSize()

git-svn-id: https://svn.wxwidgets.org/svn/wx/wxWidgets/trunk@21600 c3d73ce0-8a6f-49c7-b76d-6d57e0e08775

docs/latex/wx/strmbase.tex

@@ -100,9 +100,5 @@ the file.
 \wxheading{Warning}
 
 There are streams which do not have size by definition, such as socket streams.
-In that cases, GetSize returns an invalid size represented by
-
-\begin{verbatim}
-~(size_t)0
-\end{verbatim}
+In that cases, GetSize returns $0$ so you should always test its return value.
 

include/wx/stream.h

@@ -81,7 +81,7 @@ public:
     // reset the stream state
     void Reset() { m_lasterror = wxSTREAM_NO_ERROR; }
 
-    // deprecated (doesn't make sense!), don't use
+    // this doesn't make sense for all streams, always test its return value
     virtual size_t GetSize() const { return 0; }
 
 #if WXWIN_COMPATIBILITY_2_2