Fixed the feed/bind constraint in the docs.

doc/Control

@@ -66,7 +66,7 @@ bind(bind(x, f), g) = bind(x, fun(X) -> bind(f X, g) end)
 bind(x, return) = x
 bind(return(x), f) = f x
 
-feed(x, func(f)) = bind(x, f)
+feed(x, suspend(f)) = bind(x, f)
 
 
 Scattering