Make a few things for staking miner (#9241)

substrate/frame/system/src/lib.rs

@@ -581,7 +581,7 @@ pub mod pallet {
 	/// Events deposited for the current block.
 	#[pallet::storage]
 	#[pallet::getter(fn events)]
-	pub(super) type Events<T: Config> =
+	pub type Events<T: Config> =
 		StorageValue<_, Vec<EventRecord<T::Event, T::Hash>>, ValueQuery>;
 
 	/// The number of events in the `Events<T>` list.