Merge pull request codeigniter4#7598 from kenjis/docs-TestResponse

docs: fix incorrect PHPDoc types in TestResponse

system/Test/TestResponse.php

@@ -350,7 +350,7 @@ public function assertCookieExpired(string $key, string $prefix = '')
     /**
      * Returns the response's body as JSON
      *
-     * @return false|string|null
+     * @return false|string
      */
     public function getJSON()
     {
@@ -385,7 +385,7 @@ public function assertJSONFragment(array $fragment, bool $strict = false)
      * Asserts that the JSON exactly matches the passed in data.
      * If the value being passed in is a string, it must be a json_encoded string.
      *
-     * @param array|string $test
+     * @param array|object|string $test
      *
      * @throws Exception
      */