docs: add () after method names

Author: kenjis

user_guide_src/source/installation/upgrade_405.rst

@@ -32,8 +32,8 @@ to all classes that extend ``Message`` as well: ``Request``, ``Response`` and th
 
 Additional related deprecations from the HTTP layer:
 
-* ``Message::isJSON``: Check the "Content-Type" header directly
-* ``Request[Interface]::isValidIP``: Use the Validation class with ``valid_ip``
+* ``Message::isJSON()``: Check the "Content-Type" header directly
+* ``Request[Interface]::isValidIP()``: Use the Validation class with ``valid_ip``
 * ``Request[Interface]::getMethod()``: The ``$upper`` parameter will be removed, use str_to_upper()
 * ``Request[Trait]::$ipAddress``: This property will become private
 * ``Request::$proxyIPs``: This property will be removed; access ``config('App')->proxyIPs`` directly