docs: test FQCN

Author: kenjis

user_guide_src/source/incoming/incomingrequest.rst

@@ -250,7 +250,7 @@ The methods provided by the parent classes that are available are:
 * :meth:`CodeIgniter\\HTTP\\Message::getProtocolVersion`
 * :meth:`CodeIgniter\\HTTP\\Message::setProtocolVersion`
 
-.. php:class:: IncomingRequest
+.. php:class:: CodeIgniter\HTTP\IncomingRequest
 
     .. php:method:: isCLI()