Added links to Observer methods that create EventKeys

Author: oscar-benderstone

crates/bevy_ecs/src/event/base.rs

@@ -424,9 +424,14 @@ pub(crate) struct EventInstance<E: BufferedEvent> {
 
 /// # Warning
 ///
-/// Should only be instantiated internally to this crate.
-/// </section>
 /// This struct should only be instantiated internally to this crate.
+///
+/// [`EventKey`]s are created in:
+/// - [`crate::observer::trigger_dynamic_ref_with_caller`]
+/// - [`crate::observer::trigger_dynamic_ref_with_caller`]
+/// - [`crate::observer::observer_multiple_events`]
+/// - [`crate::observer::observer_dynamic_trigger`]
+/// - [`crate::observer::runner::hook_on_add`]
 #[derive(Debug, Copy, Clone, Hash, Ord, PartialOrd, Eq, PartialEq)]
 pub struct EventKey(pub(crate) ComponentId);