fix clippy lint

examples/signals.rs

@@ -40,7 +40,7 @@ fn app(cx: Scope) -> Element {
         }
 
         // We can also use the signal value as a slice
-        if let &[ref first, ..,  ref last] = saved_values.read().as_slice() {
+        if let [ref first, .., ref last] = saved_values.read().as_slice() {
             rsx! { li { "First and last: {first}, {last}" } }
         } else {
             rsx! { "No saved values" }