message: docs: update localize migration doc
  The error message has been updated in to mention `ng add
  This also fixes the tslint config (it needs to mention the complete side effect import).
  PR Close
diff: @@ -43,8 +43,10 @@ This has the side-effect of attaching a minimal implementation of `$localize` to
  If this import is missing, you will see an error message like this:
  ```
  -Error: The global function `$localize` is missing.
  -Please add `import '@angular/localize/init';` to your polyfills.ts file.
  +Error: It looks like your application or one of its dependencies is using i18n.
  +Angular 9 introduced a global `$localize()` function that needs to be loaded.
  +Please run `ng add @angular/localize` from the Angular CLI.
  +(For non-CLI projects, add `import '@angular/localize/init';` to your polyfills.ts file)
  ```
  This schematic automatically adds the `@angular/localize/init` import for you
  @@ -60,7 +62,7 @@ The import of `@angular/localize/init` may cause a tslint error for `no-import-s
  "no-import-side-effect": [
  true,
  {
  - "ignore-module": "(core-js/.*|zone\\.js/.*|@angular\/localize)$"
  + "ignore-module": "(core-js/.*|zone\\.js/.*|@angular/localize/init)$"
  }
  ]
  