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

packages/hooks/README.md

@@ -15,8 +15,8 @@ You can always use it "normally" with the `split` method:
 
 ```rust
 // Rusty-smart-pointer usage:
-let value = use_state(&cx, || 10);
+let value = use_state(cx, || 10);
 
 // "Classic" usage:
-let (value, set_value) = use_state(&cx, || 0).split();
+let (value, set_value) = use_state(cx, || 0).split();
 ```