phpdoc armageddon for master, pass 1

src/block/utils/Fallable.php

@@ -31,8 +31,6 @@ interface Fallable{
 	 * Called every tick by FallingBlock to update the falling state of this block. Used by concrete to check when it
 	 * hits water.
 	 * Return null if you don't want to change the usual behaviour.
-	 *
-	 * @return Block|null
 	 */
 	public function tickFalling() : ?Block;
 }