phpstan: use more class-string

src/item/ProjectileItem.php

@@ -38,6 +38,7 @@ abstract class ProjectileItem extends Item{
 	 * Returns the entity type that this projectile creates. This should return a ::class extending Throwable.
 	 *
 	 * @return string class extends Throwable
+	 * @phpstan-return class-string<Throwable>
 	 */
 	abstract public function getProjectileEntityClass() : string;
 

src/item/SpawnEgg.php

@@ -33,11 +33,15 @@ use function lcg_value;
 
 class SpawnEgg extends Item{
 
-	/** @var string */
+	/**
+	 * @var string
+	 * @phpstan-var class-string<Entity>
+	 */
 	private $entityClass;
 
 	/**
 	 * @param string $entityClass instanceof Entity
+	 * @phpstan-param class-string<Entity> $entityClass
 	 *
 	 * @throws \InvalidArgumentException
 	 */