docs(@angular/cli): update e2e long description

angular · Aug 2, 2021 · a15875a · a15875a
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diff --git a/packages/angular/cli/commands/e2e-long.md b/packages/angular/cli/commands/e2e-long.md
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-Must be executed from within a workspace directory.
-When a project name is not supplied, it will execute for all projects.
+The command takes an optional project name, as specified in the `projects` section of the `angular.json` workspace configuration file.
+When a project name is not supplied, executes the `e2e` builder for the default project.
+
+To use the `ng e2e` command, use `ng add` to add a package that implements end-to-end testing capabilities. Adding the package automatically updates your workspace configuration, adding an `e2e` [CLI builder](guide/cli-builder).