message: Fix default login shell documentation
diff: @@ -363,7 +363,8 @@ live_config_reload: true
  # Entries in `shell.args` are passed unmodified as arguments to the shell.
  #
  # Default:
  -# - (Linux/macOS) /bin/bash --login
  +# - (macOS) /bin/bash --login
  +# - (Linux) user login shell
  # - (Windows) powershell
  #shell:
  # program: /bin/bash
  