Fix MusicGen logging error (#26370)

* Fix logging error

* Update modeling_musicgen.py

* Update modeling_musicgen.py

src/transformers/models/musicgen/modeling_musicgen.py

@@ -1310,8 +1310,7 @@ class MusicgenForCausalLM(MusicgenPreTrainedModel):
         if has_default_max_length and generation_config.max_new_tokens is None and generation_config.max_length == 20:
             logger.warning(
                 f"Using the model-agnostic default `max_length` (={generation_config.max_length}) "
-                "to control the generation length.  recommend setting `max_new_tokens` to control the maximum length of the generation.",
-                UserWarning,
+                "to control the generation length.  recommend setting `max_new_tokens` to control the maximum length of the generation."
             )
         elif generation_config.max_new_tokens is not None:
             if not has_default_max_length:
@@ -2350,8 +2349,7 @@ class MusicgenForConditionalGeneration(PreTrainedModel):
         if has_default_max_length and generation_config.max_new_tokens is None:
             logger.warning(
                 f"Using the model-agnostic default `max_length` (={generation_config.max_length}) "
-                "to control the generation length.  recommend setting `max_new_tokens` to control the maximum length of the generation.",
-                UserWarning,
+                "to control the generation length. We recommend setting `max_new_tokens` to control the maximum length of the generation."
             )
         elif generation_config.max_new_tokens is not None:
             if not has_default_max_length: