Warn that Added/Changed filters do not see deferred changes (bevyengi…

…ne#10681)

Explain bevyengine#10625.

This might be obvious to those familiar with Bevy internals, but it
surprised me.

---------

Co-authored-by: Alice Cecile <alice.i.cecile@gmail.com>

crates/bevy_ecs/src/query/filter.rs

@@ -551,6 +551,12 @@ impl_tick_filter!(
     /// To retain all results without filtering but still check whether they were added after the
     /// system last ran, use [`Ref<T>`](crate::change_detection::Ref).
     ///
+    /// # Deferred
+    ///
+    /// Note, that entity modifications issued with [`Commands`](crate::system::Commands)
+    /// are visible only after deferred operations are applied,
+    /// typically at the end of the schedule iteration.
+    ///
     /// # Examples
     ///
     /// ```
@@ -587,6 +593,13 @@ impl_tick_filter!(
     /// To retain all results without filtering but still check whether they were changed after the
     /// system last ran, use [`Ref<T>`](crate::change_detection::Ref).
     ///
+    /// # Deferred
+    ///
+    /// Note, that entity modifications issued with [`Commands`](crate::system::Commands)
+    /// (like entity creation or entity component addition or removal)
+    /// are visible only after deferred operations are applied,
+    /// typically at the end of the schedule iteration.
+    ///
     /// # Examples
     ///
     /// ```