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

docs/guide/examples/hooks_counter_two_state.rs

@@ -8,8 +8,8 @@ fn main() {
 // ANCHOR: component
 fn App(cx: Scope) -> Element {
     // ANCHOR: use_state_calls
-    let mut count_a = use_state(&cx, || 0);
-    let mut count_b = use_state(&cx, || 0);
+    let mut count_a = use_state(cx, || 0);
+    let mut count_b = use_state(cx, || 0);
     // ANCHOR_END: use_state_calls
 
     cx.render(rsx!(