docs: Expand  `--debug` option description in the CLI documentation (#15308)
docs: Expand  `--debug` option description in the CLI documentation (#15308)

* docs: Expand `--debug` option description

* Update command-line-interface.md
eslint/eslint,Trott/eslint,eslint/eslint,Trott/eslint,DavidAnson/eslint,DavidAnson/eslint