docs: update local examples and docs to support new syntaxes

examples/hydration.rs

@@ -19,8 +19,8 @@ fn main() {
     dioxus::desktop::launch(App, |c| c.with_prerendered(content));
 }
 
-static App: Component<()> = |cx, props| {
-    let mut val = use_state(cx, || 0);
+static App: Component<()> = |cx| {
+    let mut val = use_state(&cx, || 0);
 
     cx.render(rsx! {
         div {