replaced class with method.

Because these classes are NOT originally `final` class in PHP 8.0.
https://github.com/php/php-src/blob/PHP-8.0/ext/reflection/php_reflection.stub.php

Author: mumumu

reference/reflection/reflectionextension/clone.xml

@@ -44,7 +44,7 @@
      <row>
       <entry>8.1.0</entry>
       <entry>
-       The method is no longer <modifier>final</modifier>.
+       This method is no longer <modifier>final</modifier>.
       </entry>
      </row>
     </tbody>

reference/reflection/reflectionfunctionabstract/clone.xml

@@ -46,7 +46,7 @@
      <row>
       <entry>8.1.0</entry>
       <entry>
-       The class is no longer <modifier>final</modifier>.
+       This method is no longer <modifier>final</modifier>.
       </entry>
      </row>
     </tbody>

reference/reflection/reflectionparameter/clone.xml

@@ -46,7 +46,7 @@
      <row>
       <entry>8.1.0</entry>
       <entry>
-       The class is no longer <modifier>final</modifier>.
+       This method is no longer <modifier>final</modifier>.
       </entry>
      </row>
     </tbody>

reference/reflection/reflectionproperty/clone.xml

@@ -46,7 +46,7 @@
      <row>
       <entry>8.1.0</entry>
       <entry>
-       The class is no longer <modifier>final</modifier>.
+       This method is no longer <modifier>final</modifier>.
       </entry>
      </row>
     </tbody>

reference/reflection/reflectionzendextension/clone.xml

@@ -46,7 +46,7 @@
      <row>
       <entry>8.1.0</entry>
       <entry>
-       The class is no longer <modifier>final</modifier>.
+       This method is no longer <modifier>final</modifier>.
       </entry>
      </row>
     </tbody>