message: docs: update /deep/ to ::ng-deep in component styles example
  Update example because ::ng-deep is the preferred syntax.
  PR Close
diff: /* #enddocregion hostcontext */
  /* #docregion deep */
  -:host /deep/ h3 {
  +:host ::ng-deep h3 {
  font-style: italic;
  }
  /* #enddocregion deep */
  