add note on self-extends skip

Author: TomasVotruba

rules/Renaming/NodeManipulator/ClassRenamer.php

@@ -189,7 +189,7 @@ private function refactorClassLike(ClassLike $classLike, array $oldToNewClasses,
             $extendsName = $classLike->extends->toString();
             $newName = $oldToNewClasses[$extendsName] ?? null;
 
-            // skip when the class would extend itself after rename
+            // skip when the class would extend itself after rename; this might happen when you run a rename class on new child class that extends the deprecated one
             if ($newName !== null
                 && $newName !== $this->nodeNameResolver->getName($classLike)
                 && $this->isClassToInterfaceValidChange($classLike->extends, $newName)