message: clarify draining option docs
diff: @@ -200,13 +200,14 @@ following are the command line options that Envoy supports.
  .. option:: --drain-time-s <integer>
  - *(optional)* The time in seconds that Envoy will drain connections during a hot restart. See the
  - :ref:`hot restart overview <arch_overview_hot_restart>` for more information. Defaults to 600
  - seconds (10 minutes). Generally the drain time should be less than the parent shutdown time
  - set via the :option:`--parent-shutdown-time-s` option. How the two settings are configured
  - depends on the specific deployment. In edge scenarios, it might be desirable to have a very long
  - drain time. In service to service scenarios, it might be possible to make the drain and shutdown
  - time much shorter (e.g., 60s/90s).
  + *(optional)* The time in seconds that Envoy will drain connections during
  + a :ref:`hot restart <arch_overview_hot_restart>` or when individual listeners are being
  + modified or removed via :ref:`LDS <arch_overview_dynamic_config_lds>`.
  + Defaults to 600 seconds (10 minutes). Generally the drain time should be less than
  + the parent shutdown time set via the :option:`--parent-shutdown-time-s` option. How the two
  + settings are configured depends on the specific deployment. In edge scenarios, it might be
  + desirable to have a very long drain time. In service to service scenarios, it might be possible
  + to make the drain and shutdown ime much shorter (e.g., 60s/90s).
  .. option:: --parent-shutdown-time-s <integer>
  