Remove unneeded use_auth_token (huggingface#839)

Author: osanseviero

examples/dreambooth/README.md

@@ -142,7 +142,7 @@ export CLASS_DIR="path-to-class-images"
 export OUTPUT_DIR="path-to-save-model"
 
 accelerate launch train_dreambooth.py \
-  --pretrained_model_name_or_path=$MODEL_NAME --use_auth_token \
+  --pretrained_model_name_or_path=$MODEL_NAME \
   --instance_data_dir=$INSTANCE_DIR \
   --class_data_dir=$CLASS_DIR \
   --output_dir=$OUTPUT_DIR \