message: docs(router): make getCurrentNavigation() jsdoc more explicit
  Add additional clarification to the documentation for
  `getCurrentNavigation`.
  PR Close
diff: @@ -1027,7 +1027,10 @@ export class Router {
  return this.serializeUrl(this.currentUrlTree);
  }
  - /** The current Navigation object if one exists */
  + /**
  + * Returns the current `Navigation` object when the router is navigating,
  + * and `null` when idle.
  + */
  getCurrentNavigation(): Navigation|null {
  return this.currentNavigation;
  }
  