Fix comment formatting for layer creation section

This is a small change to see if we can kick off a dist/ build for the sample, which somehow did not get run the first time around.

Author: willum070

samples/3d-hero-showcase/index.ts

@@ -124,7 +124,7 @@ async function init() {
     });
     document.body.append(map);
 
-    // 2. Create Layers
+    // 2. Create the layers
 
     // Polyline: Prinsengracht canal route (flat, orange)
     canalPolyline = new Polyline3DElement({