[optim] clean apollo (#6645)

* clean apollo code

* update readme

src/llamafactory/model/model_utils/misc.py

@@ -27,7 +27,7 @@ logger = logging.get_logger(__name__)
 
 def find_all_linear_modules(model: "PreTrainedModel", freeze_vision_tower: bool) -> List[str]:
     r"""
-    Finds all available modules to apply lora or galore or apollo.
+    Finds all available modules to apply LoRA, GaLore or APOLLO.
     """
     model_type = getattr(model.config, "model_type", None)
     forbidden_modules = {"lm_head"}