Reword the section on bug reporting.

manual.scrbl

@@ -20,10 +20,9 @@ Racket yet.
 
 @section{Bug reporting}
 
-When encountering a bug, please strip the type annotations and try the
-resulting code with the generic graph library, without this interface.  If you
-can reproduce the bug, then you should probably report it to the maintainer of
-the graph library directly.  If not or if unsure, feel free to report it to me.
+If you find a bug, first try running your code directly with the graph library,
+in untyped Racket.  If the bug persists, you should probably report it to the
+maintainer of the graph library directly.  If unsure, report the bug to me.
 
 @section{Contributing}