message: Add pointer to valid components in docs
diff: @@ -79,7 +79,7 @@ following are the command line options that Envoy supports.
  *(optional)* The comma separated list of logging level per component. Non developers should generally
  never set this option. For example, if you want `upstream` component to run at `debug` level and
  `connection` component to run at `trace` level, you should pass ``upstream:debug,connection:trace`` to
  - this flag.
  + this flag. See ``ALL_LOGGER_IDS`` in :repo:`/source/common/common/logger.h` for a list of components.
  .. option:: --log-path <path string>
  