docs(aio): update migrated content from anguar.io

aio/content/examples/webpack/src/polyfills.ts

@@ -0,0 +1,12 @@
+// #docregion
+import 'core-js/es6';
+import 'core-js/es7/reflect';
+require('zone.js/dist/zone');
+
+if (process.env.ENV === 'production') {
+  // Production
+} else {
+  // Development and test
+  Error['stackTraceLimit'] = Infinity;
+  require('zone.js/dist/long-stack-trace-zone');
+}