chore: rename all &cx to cx, make clipppy happy

notes/README.md

@@ -233,7 +233,7 @@ use hooks to define state and modify it from within listeners.
 
 ```rust, ignore
 fn app(cx: Scope) -> Element {
-    let name = use_state(&cx, || "world");
+    let name = use_state(cx, || "world");
 
     render!("hello {name}!")
 }
@@ -280,7 +280,7 @@ fn main() {
 }
 
 fn App(cx: Scope) -> Element {
-    let count = use_state(&cx, || 0);
+    let count = use_state(cx, || 0);
 
     cx.render(rsx!(
         div { "Count: {count}" }