PHP/DontExtract: update code comment for namespaced function calls tests

Author: rodrigoprimo

WordPress/Tests/PHP/DontExtractUnitTest.inc

@@ -9,7 +9,7 @@ $this->extract(); // Ok.
 $my_object->extract(); // Ok.
 
 /*
- * Safeguard support for PHP 8.0+ tokenization of namespaced "names".
+ * Safeguard correct handling of all types of namespaced function calls
  */
 \extract( array( 'a' => 1 ) );
 MyNamespace\extract( array( 'a' => 1 ) );