events: Add paragraph about replies to edited events.
@@ -4,6 +4,9 @@ the previous message, for which the room ID is required. If you want to reply to
[`OriginalSyncRoomMessageEvent`], you have to convert it first by calling
[`.into_full_event()`][crate::events::OriginalSyncMessageLikeEvent::into_full_event].
+If the message was edited, the previous message should be the original message that was edited,
+with the content of its replacement, to allow the fallback to be accurate at the time it is added.
+
It is recommended to enable the `sanitize` feature when using this method as this will
clean up nested [rich reply fallbacks] in chains of replies. This uses [`sanitize_html()`]
internally, with [`RemoveReplyFallback::Yes`].
