fix Issue 1918 - __traits(getVirtualFunctions) returns final functions

traits.dd

@@ -152,6 +152,7 @@ $(H2 $(GNAME isVirtualFunction))
 
 	$(P Takes one argument. If that argument is a virtual function,
 	$(B true) is returned, otherwise $(B false).
+	Note that final functions are virtual.
 	)
 
 ---
@@ -375,6 +376,7 @@ $(H2 $(GNAME getVirtualFunctions))
 	The second argument is a string that matches the name of
 	one of the functions of that class.
 	The result is a tuple of the virtual overloads of that function.
+	Note that final functions are virtual.
 	)
 
 ---