message: docs(router): Complete `QueryParamsHandling` documentation
  `QueryParamsHandling` has a third possibility which is the default behavior,
  and it was not documented until now.
  PR Close
diff: @@ -131,8 +131,9 @@ export type LoadChildren = LoadChildrenCallback;
  *
  * How to handle query parameters in a router link.
  * One of:
  - * - `merge` : Merge new with current parameters.
  - * - `preserve` : Preserve current parameters.
  + * - `"merge"` : Merge new parameters with current parameters.
  + * - `"preserve"` : Preserve current parameters.
  + * - `""` : Replace current parameters with new parameters. This is the default behavior.
  *
  * @see `UrlCreationOptions#queryParamsHandling`
  * @see `RouterLink`
  