Add more comments and cleanup out of date comments

src/lib.rs

@@ -185,6 +185,7 @@ impl StateResolution {
                 .collect::<Vec<_>>()
         );
 
+        // This "epochs" power level event
         let power_event = resolved_control.get(&(EventType::RoomPowerLevels, "".into()));
 
         tracing::debug!("PL {:?}", power_event);

tests/state_res.rs

@@ -367,12 +367,9 @@ fn do_check(
 
         let mut state_after = state_before.clone();
 
-        // if fake_event.state_key().is_some() {
         let ty = fake_event.kind().clone();
-        // we know there is a state_key unwrap OK
         let key = fake_event.state_key().clone();
         state_after.insert((ty, key), event_id.clone());
-        // }
 
         let auth_types = state_res::auth_types_for_event(
             fake_event.kind(),