docs: move decrement to the left side (#673)

This makes more sense for left-to-right language readers I think.

packages/www/src/pages/index.tsx

@@ -24,12 +24,12 @@ function CustomCounter(props, { state }) {
   return (
     <>
       <div>Counter: {count.value}</div>
-      <button onClick={() => count.value++}>
-        Increment
-      </button>
       <button onClick={() => count.value--}>
         Decrement
       </button>
+      <button onClick={() => count.value++}>
+        Increment
+      </button>
     </>
   );
 }