Fix small typo (huggingface#1178)

Unless it's intentional, lol

Author: pcuenca

src/diffusers/configuration_utils.py

@@ -101,7 +101,7 @@ def save_config(self, save_directory: Union[str, os.PathLike], push_to_hub: bool
         output_config_file = os.path.join(save_directory, self.config_name)
 
         self.to_json_file(output_config_file)
-        logger.info(f"ConfigMixinuration saved in {output_config_file}")
+        logger.info(f"Configuration saved in {output_config_file}")
 
     @classmethod
     def from_config(cls, pretrained_model_name_or_path: Union[str, os.PathLike], return_unused_kwargs=False, **kwargs):