fix a merge artefact

Author: joseph-gio

crates/bevy_ecs/src/system/system_param.rs

@@ -153,8 +153,6 @@ pub unsafe trait SystemParam: Sized {
 
     /// Applies any deferred mutations stored in this [`SystemParam`]'s state.
     /// This is used to apply [`Commands`] during [`apply_system_buffers`](crate::prelude::apply_system_buffers).
-    ///
-    /// [`Commands`]: crate::prelude::Commands
     #[inline]
     #[allow(unused_variables)]
     fn apply(state: &mut Self::State, system_meta: &SystemMeta, world: &mut World) {}