Clarify parent/children relation replication (#671)

Co-authored-by: Hennadii Chernyshchyk <genaloner@gmail.com>

Author: almindor

src/lib.rs

@@ -245,8 +245,10 @@ the desired components. See [receive markers](#receive-markers) for more details
 #### Component relations
 
 Some components depend on each other. For example, [`ChildOf`] and [`Children`]. You can enable
-replication only for [`ChildOf`] and [`Children`] will be updated automatically on insertion.
-This will emit a [`B0004`](https://bevy.org/learn/errors/b0004) warning which can be safely ignored.
+replication only for [`ChildOf`] so that [`Children`] will be updated automatically on insertion.
+Related entities replicate like any others, so children should also have [`Replicated`].
+
+Currently `ChildOf` replication emits a [`B0004`](https://bevy.org/learn/errors/b0004) warning which can be safely ignored.
 See [#19776](https://github.com/bevyengine/bevy/issues/19776) for more details.
 
 You can also ensure that their mutations arrive in sync by using [`SyncRelatedAppExt::sync_related_entities`].