Update facade docblocks

Author: timacdonald

src/Illuminate/Support/Facades/Cache.php

@@ -5,6 +5,7 @@
 /**
  * @method static \Illuminate\Contracts\Cache\Repository store(string|null $name = null)
  * @method static \Illuminate\Contracts\Cache\Repository driver(string|null $driver = null)
+ * @method static \Illuminate\Contracts\Cache\Repository memo(string|null $driver = null)
  * @method static \Illuminate\Contracts\Cache\Repository resolve(string $name)
  * @method static \Illuminate\Cache\Repository build(array $config)
  * @method static \Illuminate\Cache\Repository repository(\Illuminate\Contracts\Cache\Store $store, array $config = [])