Adjust migration guide

Author: stevesloan

release-content/migration-guides/atmosphere_multicam.md

@@ -7,20 +7,4 @@ Atmosphere now works correctly with multiple cameras. No action is required for
 
 `init_atmosphere_buffer` has been removed, and `AtmosphereBuffer` has been changed from a `Resource` to a `Component` attached to each camera entity.
 
-If you were directly accessing `AtmosphereBuffer` as a resource, you'll need to query for it instead:
-
-```rust
-// Before
-fn my_system(atmosphere_buffer: Option<Res<AtmosphereBuffer>>) {
-    if let Some(buffer) = atmosphere_buffer {
-        // use buffer
-    }
-}
-
-// After
-fn my_system(views: Query<&AtmosphereBuffer, With<Camera3d>>) {
-    for buffer in &views {
-        // use buffer
-    }
-}
-```
+If you were directly accessing `AtmosphereBuffer` as a resource in a render world system, you'll need to query for it as a component on camera entities instead.