docs(aio): Cleanup examples with edits from Igor/George (#23234)

PR Close #23234

aio/tools/examples/shared/boilerplate/cli/.gitignore

@@ -35,7 +35,7 @@ testem.log
 yarn-error.log
 
 # e2e
-/e2e/(?!protractor)*.js
+/e2e/*.js
 /e2e/*.map
 
 # System Files

aio/tools/examples/shared/boilerplate/cli/src/polyfills.ts

@@ -50,7 +50,7 @@ import 'core-js/es7/reflect';
  * Required to support Web Animations `@angular/platform-browser/animations`.
  * Needed for: All but Chrome, Firefox and Opera. http://caniuse.com/#feat=web-animation
  **/
-import 'web-animations-js';  // Run `npm install --save web-animations-js`.
+// import 'web-animations-js';
 
 /**
  * By default, zone.js will patch all possible macroTask and DomEvents