Update facade docblocks

Author: taylorotwell

src/Illuminate/Support/Facades/Context.php

@@ -7,8 +7,8 @@
  * @method static bool hasHidden(string $key)
  * @method static array all()
  * @method static array allHidden()
- * @method static mixed get(string $key)
- * @method static mixed getHidden(string $key)
+ * @method static mixed get(string $key, mixed $default = null)
+ * @method static mixed getHidden(string $key, mixed $default = null)
  * @method static array only(array $keys)
  * @method static array onlyHidden(array $keys)
  * @method static \Illuminate\Log\Context\Repository add(string|array $key, mixed $value = null)