message: build(aio): don't process unnecessary example files in doc-gen
  This lowers the `yarn docs` processing time by about 40% (from 50 secs
  to 30 secs).
diff: @@ -118,6 +118,27 @@ module.exports =
  {
  basePath: CONTENTS_PATH,
  include: CONTENTS_PATH + '/examples/**/*',
  + exclude: [
  + '**/*plnkr.no-link.html',
  + '**/node_modules/**',
  + // _boilerplate files
  + '**/_boilerplate/**',
  + '**/*/src/styles.css',
  + '**/*/src/systemjs-angular-loader.js',
  + '**/*/src/systemjs.config.js',
  + '**/*/src/tsconfig.json',
  + '**/*/bs-config.e2e.json',
  + '**/*/bs-config.json',
  + '**/*/package.json',
  + '**/*/tslint.json',
  + // example files
  + '**/_test-output',
  + '**/protractor-helpers.js',
  + '**/e2e-spec.js',
  + '**/ts/**/*.js',
  + '**/js-es6*/**/*.js',
  + '**/ts-snippets/**/*.js',
  + ],
  fileReader: 'exampleFileReader'
  },
  {
  