events: Update doctest
//!
//! // The downside of this event is we cannot use it with event enums,
//! // but could be deserialized from a `Raw<_>` that has failed to deserialize.
-//! matches::assert_matches!(
+//! assert_matches::assert_matches!(
//! serde_json::from_value::<OriginalSyncMessageLikeEvent<ReactionEventContent>>(json),
//! Ok(OriginalSyncMessageLikeEvent {
//! content: ReactionEventContent {
