docs: update the description of the lint command

Update the description of the lint command for when a project name is not provided.

Closes #21619

(cherry picked from commit 9c62ddc)

Author: TrevorKarjanis

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

@@ -1,5 +1,5 @@
 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 `lint` builder for the default project.
+When a project name is not supplied, executes the `lint` builder for all projects.
 
 To use the `ng lint` command, use `ng add` to add a package that implements linting capabilities. Adding the package automatically updates your workspace configuration, adding a lint [CLI builder](guide/cli-builder).
 For example: