* replaced "uses objpas;" with "{$mode objfpc}" in property example

docs/ref.tex

@@ -2057,7 +2057,7 @@ or write several properties with the same function. For this, the properties
 must have the same type.
 The following is an example of a property with an index:
 \begin{verbatim}
-uses objpas;
+{$mode objfpc}
 Type TPoint = Class(TObject)
        Private
        FX,FY : Longint;