ecs: fix a typo in docs

lyra-ecs/src/system/fn_sys.rs

@@ -37,7 +37,7 @@ pub trait FnArgFetcher {
 /// fetched on the fly.
 /// 
 /// ```fail_compile
-/// fn enemy_movement_system(enemies: ViewState<(&Health, &EnemyStats, &Movement)>) -> anyhow::Result<()> {
+/// fn enemy_movement_system(enemies: View<(&Health, &EnemyStats, &Movement)>) -> anyhow::Result<()> {
 ///     for (health, stats, movement) in enemies.iter() {
 ///         // ...
 ///     }