Update facade docblocks

Author: taylorotwell

src/Illuminate/Support/Facades/Request.php

@@ -174,6 +174,8 @@
  * @method static \Illuminate\Support\Collection collect(array|string|null $key = null)
  * @method static array only(array|mixed $keys)
  * @method static array except(array|mixed $keys)
+ * @method static \Illuminate\Http\Request|mixed when(\Closure|mixed|null $value = null, callable|null $callback = null, callable|null $default = null)
+ * @method static \Illuminate\Http\Request|mixed unless(\Closure|mixed|null $value = null, callable|null $callback = null, callable|null $default = null)
  * @method static void macro(string $name, object|callable $macro)
  * @method static void mixin(object $mixin, bool $replace = true)
  * @method static bool hasMacro(string $name)