Fix return types in Facade PHPDoc for clear() and forget() (spatie#505)

- `clear()`: returns `bool` but PHPDoc said `void`
- `forget()`: returns `self` (ResponseCache) but PHPDoc said `void`
- Also renamed `$key` to `$uris` in forget() to match actual signature

Author: alies-dev

src/Facades/ResponseCache.php

@@ -5,8 +5,8 @@
 use Illuminate\Support\Facades\Facade;
 
 /**
- * @method static void clear(array $tags = [])
- * @method static void forget(string|array $key, array $tags = [])
+ * @method static bool clear(array $tags = [])
+ * @method static \Spatie\ResponseCache\ResponseCache forget(string|array $uris, array $tags = [])
  * @method static bool enabled(\Illuminate\Http\Request $request)
  * @method static bool shouldCache(\Illuminate\Http\Request $request, \Symfony\Component\HttpFoundation\Response $response)
  * @method static bool shouldBypass(\Illuminate\Http\Request $request)