entity: populate missing return type information

src/pocketmine/entity/Entity.php

@@ -2285,6 +2285,7 @@ abstract class Entity extends Location implements Metadatable, EntityIds{
 	 * @param string $name
 	 * @param mixed $value
 	 *
+	 * @return void
 	 * @throws \ErrorException
 	 * @throws \InvalidArgumentException
 	 */

src/pocketmine/entity/Explosive.php

@@ -26,5 +26,8 @@ namespace pocketmine\entity;
 
 interface Explosive{
 
+	/**
+	 * @return void
+	 */
 	public function explode();
 }