docs: update local examples and docs to support new syntaxes

examples/tasks.rs

@@ -6,11 +6,11 @@ use std::time::Duration;
 
 use dioxus::prelude::*;
 fn main() {
-    dioxus::desktop::launch(App, |c| c);
+    dioxus::desktop::launch(App);
 }
 
-static App: Component<()> = |cx, props| {
-    let mut count = use_state(cx, || 0);
+static App: Component<()> = |cx| {
+    let mut count = use_state(&cx, || 0);
 
     cx.push_task(async move {
         tokio::time::sleep(Duration::from_millis(100)).await;