Update idioms of a few examples

* Use `TypedArray::view` now that it exists.
* Don't hack around `instantiateStreaming`

examples/raytrace-parallel/index.html

@@ -216,7 +216,6 @@
     <canvas id='canvas'></canvas>
 
     <script>
-      delete WebAssembly.instantiateStreaming;
       document.getElementById('render').disabled = true;
       document.getElementById('concurrency').disabled = true;
     </script>