docs: clarify that the options of ng lint in AIO are of the deprecated builder

Fix: #19638
(cherry picked from commit efcec62)

Author: alan-agius4

packages/angular/cli/commands/lint-long.md

@@ -1,4 +1,7 @@
 Takes the name of the project, as specified in the  `projects` section of the `angular.json` workspace configuration file.
 When a project name is not supplied, it will execute for all projects.
 
-The default linting tool is [TSLint](https://palantir.github.io/tslint/), and the default configuration is specified in the project's `tslint.json` file.
+The default linting tool is [TSLint](https://palantir.github.io/tslint/), and the default configuration is specified in the project's `tslint.json` file.
+
+**Note**: TSLint has been discontinued and support has been deprecated in the Angular CLI. The options shown below are for the deprecated TSLint builder.
+To opt-in using the community driven ESLint builder, see [angular-eslint](https://github.com/angular-eslint/angular-eslint#migrating-from-codelyzer-and-tslint) README.