Update outdated RouteParameters docs

As `RouteParameters` are not included anymore in
`Event::PaymentPathFailed` since 0.0.115.

Author: tnull

lightning/src/routing/router.rs

@@ -436,10 +436,7 @@ impl Readable for Route {
 
 /// Parameters needed to find a [`Route`].
 ///
-/// Passed to [`find_route`] and [`build_route_from_hops`], but also provided in
-/// [`Event::PaymentPathFailed`].
-///
-/// [`Event::PaymentPathFailed`]: crate::events::Event::PaymentPathFailed
+/// Passed to [`find_route`] and [`build_route_from_hops`].
 #[derive(Clone, Debug, PartialEq, Eq)]
 pub struct RouteParameters {
 	/// The parameters of the failed payment path.