message: docs: add doc for TrackByFunction
  PR Close
diff: @@ -119,10 +119,8 @@ export interface CollectionChangeRecord<V> extends IterableChangeRecord<V> {}
  /**
  * An optional function passed into the `NgForOf` directive that defines how to track
  * changes for items in an iterable.
  + * The function takes the iteration index and item ID.
  * When supplied, Angular tracks changes by the return value of the function.
  - * @param index The iteration index.
  - * @param item The item ID.
  - * @return The value to use for tracking changes.
  *
  * @publicApi
  */
  